The 24-year-old has made 145 appearances for the Red Devils after completing a £25.6m switch from Porto to Old Trafford in May 2007.
Anderson initially impressed as he helped United to the Premier League title and the Champions League crown in his first season at the club.
However, the Brazil international has failed to match make more than 18 league appearances in a single campaign since 2008, partly due to a ruptured cruciate ligament in his left knee suffered in 2009, coupled with a dip in form.
“The last two years have been very difficult,” Andertson told Press Association Sport. “No-one wants a player who has a lot of injuries. But I am still young. I am only 24. And I believe I can get through this.
“All summer I stayed in Europe to work on my knee. Now I am 100 per cent. I don’t have any more injuries. I don’t have a problem.
“This is a very big season for me. In my first three years we won everything; Champions League, Premier League, Carling Cup. But then I suffered a cruciate injury and had a bad problem.
“I tried to push through it when I came back, but it was still sore. Sometimes it was bad and the pain stayed. Sometimes you think you might have to change clubs, but I love it here. The club has always helped me, as have the other players. I have worked so hard trying to get right.”
United have already invested in Borussia Dortmund’s Shinji Kagawa this summer as Ferguson looks to bolster his midfield options, with Ryan Giggs and Paul Scholes nearing retirement.
But Anderson is not fazed by Kagawa’s arrival or the prospect of further new recruits – and the former Gremio star is confident that there is a chance for him to finally blossom at Old Trafford if he can stay injury-free.
“Manchester United have some good players; Scholes, [Michael] Carrick, [Tom] Cleverley, Giggs,” he said. “If we bring in new players it will help even more, although you could say that about any club.
“The thing is, if I stay fit, I can be that player. I can be a success at United. You have seen, when I don’t have a problem, I play well. The problems come when I have an injury. After six or seven games last season it felt as though one leg was 30 per cent weaker than the other.”
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