David de Gea feeling confident, says Sir Alex FergusonSir Alex Ferguson says keeper David de Gea has shown "fantastic improvement" since his error against Blackburn in December contributed to a 3-2 defeat.
De Gea was subsequently left out for four games but, as Manchester United prepare to face Rovers at Ewood Park, Ferguson has seen a different player.
He said: "He didn't let it get to him and is playing with confidence.
"It took him time to adapt to the different ways of the English game and he is showing that now."
The United manager said that De Gea has shown similar strong-mindedness to Blackburn manager Steve Kean, who has overcome fans' protests to steer Blackburn out of the relegation zone.
"It's similar to what we were saying about Steve Kean," said Ferguson. "He got a grip of it and stood up as a man."
Blamed for Grant Hanley's winner in the first match against Blackburn this season, De Gea eventually returned against Chelsea, produced a magnificent save to repel an injury-time free-kick by Juan Mata, and has not looked back.
"The area where he's been criticised was the aerial ability in the box," added Ferguson. "He should have dealt with the last corner against Blackburn better. He knew that. He has addressed that section."
The United manager is urging caution as Premier League leaders Manchester United attempt to go five points clear by beating Blackburn.
Despite securing the title at Ewood Park last season,
United have won there just twice in 11 league visits.
"The game at Blackburn has always been a difficult match," said Ferguson. "It is a local derby and tends to be a bit feisty."
Rio Ferdinand is a slight doubt with a back problem, with former Rovers defender Phil Jones on standby if he fails to recover.
Blackburn's assistant manager Eric Black played under Ferguson at Aberdeen and he is looking to get the better of his fellow Scot in the dug-out.
"I've never been in a position to say, 'Well done' and we've taken the three points," said Black, who joined Steve Kean's backroom team at Rovers after Blackburn's win at Old Trafford on 31 December.
"I would like to experience that.
"But he's striving yet again to win the Premier League and I can guarantee he'll be as focused as he was the first time he walked into Old Trafford because that's what he does."
By Ruth Alexander BBC News
Famous football teams benefit from favourable refereeing decisions when playing at home, it has been claimed this week. Is that true?
That was the complaint after Fulham were denied a penalty against Manchester United in a Premier League 1-0 defeat at Old Trafford, Manchester, last Monday.
The Fulham manager Martin Jol said afterwards that referees needed to be "brave" to give a visiting team a penalty at Old Trafford.
And two days later, Manchester City executive Patrick Vieira gave voice to a widely held belief when he said: "When United play at home, they may get some advantage that some other teams do not get."
The assumption among some fans has long been that big refereeing decisions tend to favour the big clubs when they play in front of their large and fervent home crowd.
"If you go to Spain it's the same, if you go to Italy, it's the same," said Vieira, who played for Arsenal for many years.
Emphasising that he hadn't seen the incident in the Fulham game and wasn't criticising Manchester Utd, he added: "It's something the teams who are used to winning get all the time, so we need to win games so we may have this kind of advantage in the future."
So is there any evidence that referees are more likely to make penalty decisions that favour big teams playing at home?
Among the current English Premier League teams which have played 50 or more home games since 2006, the
statistics supplied by the sports data specialists Opta show that, on average, Manchester United have conceded one penalty every 12 home games.
This is more than Fulham, who have conceded roughly one penalty every 14 games at home.
So it is actually more common for a visiting team to get a penalty at Old Trafford than Craven Cottage.
Fulham are in fact among seven current Premier League clubs who have since 2006 conceded fewer penalties at home than Man Utd.
It's true that the team in the Premier League that has conceded the most penalties on average (one penalty every six matches) is one of the smaller clubs, Blackburn Rovers.
And also the team that has conceded the fewest (one penalty only every 18 games) is Chelsea, one of the top dogs. They have also won a penalty on average once every five games.
But there could be a far simpler explanation than referee bias, says a sports correspondent with a keen eye on the statistics, Bill Edgar of the Times newspaper.
"Given that Chelsea have been among the most successful clubs over that period, you would have expected them to have given away the fewest penalties simply because the opposition are generally weaker and therefore will spend less time in Chelsea's penalty area, so there will be less opportunity for them to win penalties," he says.
If the big clubs aren't necessarily conceding fewer penalties because of the referee, do they maybe have penalties awarded in their favour?
Manchester United have been awarded a penalty every 4.4 games, on average. This makes them the second-placed team in terms of the number of penalties won.
The first? Patrick Vieira's Manchester City. They were awarded a penalty every 3.93 games they played on average.
The two Manchester teams are the top two this season, battling it out for the Premier League trophy.
The team that ranks lowest in terms of the number of penalties won is Wolverhampton Wanderers who were awarded a penalty only every 13 matches on average.
But Vieira also complains that refs are biased towards the big clubs in Spain and Italy. And Real Madrid's manager Jose Mourinho is frequently up in arms over what he sees as bias in favour of Barcelona.
For the BBC, the sports statisticians at Opta have looked at every La Liga match involving Barcelona and Real Madrid since 2006.
The stats show that Real Madrid conceded one penalty roughly every 11 games in front of their home crowd, while Barcelona conceded one penalty in every 10 games.
So it's Jose Mourinho's own team, Real Madrid, who have a better penalty average.
And Real Madrid didn't just concede fewer penalties at home - they won more too - roughly one every four home games, compared with Barcelona's one in five.
But statistics alone do not tell us the truth about whether big teams really are favoured in the penalty area, says Edgar, who has an interesting solution.
"The only way you could really decide once and for all is to take disputed penalty instances at the home of each different Premier League team," he says.
"Then collect a panel of football experts and let them watch them. You would have the players' identities removed and the teams' identities removed and compare [the panel's] consensus with the decision the referees made.
"And if there was a considerable difference, then that would point to a bias among referees."
This kind of anonymised approach is possible in some fields. Orchestras famously introduced blind auditions where musicians played behind screens. When they did, the number of women hired rose sharply.
But it would be somewhat trickier to conduct blind experiments involving referees.
Mind you, some football fans will tell you the ref's blind anyway.
Yakubu Aiyegbeni is hoping to keep up his excellent scoring record against Manchester United and net a hat-trick when the Premier League champions visit Ewood Park on Monday night.
Yakubu struck twice at Old Trafford earlier in the season to inspire Rovers to a shock 3-2 victory against Sir Alex Ferguson's men.
The teams are now set to meet again in a match of huge significance at both ends of the table, and Yakubu has set his sights on a repeat performance.
The Nigerian believes Blackburn are capable of springing another surprise and admits he would love to notch a treble.
"Scoring against United is always special - they're one of the biggest clubs in the world," he said in The Sun.
"To score two that day at Old Trafford was a great feeling. You always want to be at your best when you play the biggest clubs.
"But I always think I can score, no matter which club I am playing against.
"Whenever I get the ball I believe I can score.
"After I get my first goal I always feel I can go on and get a second. That's what happened at Old Trafford.
"Maybe I can do it again - to go one better and get a hat-trick against United. That would be great for me."
Yakubu has impressed for Blackburn since joining the club from Everton last summer, scoring 14 Premier League goals, but he is not yet satisfied and has set a final target for the end of the season.
He said: "I want to score more than 20 goals in a season. To score more than 20 in the Premier League is always a great achievement."
United have the chance to go five points clear at the top of the table after Manchester City were held over the weekend, but Yakubu believes there will be more twists and turns in the title race.
He said: "The league will be a fight to the end. City won't just give away the title.
"United could drop points at any time.
"Already this season we have won some games people did not expect us to win."