Manchester United midfielder Anderson has been ruled out for the rest of the season after rupturing his cruciate ligament during Tuesday night's Premier League win over West Ham United.
The Brazilian suffered the injury during the first half of the 3-0 victory over the Hammers.
Tuesday's game was his first for over a month, after reports surfaced during the January transfer window that he was contemplating an exit from Old Trafford in order to increase his chances of playing first team football ahead of the summer's World Cup finals.
United boss Sir Alex Ferguson confirmed that the player was out for at least six months at his Thursday press conference, and expressed hope that the 21-year-old would be fit for the beginning of next season.
"The real bad news we've got is that Anderson's got a cruciate knee injury," Ferguson confirmed to reporters at a press conference today.
"So he'll be out for the rest of the season. That's unfortunate for the boy, it's a bad blow.
"But these type of injuries are strange. When you see a cruciate knee injury it's usually something really simple.
"He stretched to pass the ball and his knee's popped.
"It's a bad bit of news for him because he was back in the first team after being out for a few weeks.
"He was showing great energy to do well in the match so it's a blow to us, particularly with the Milan game coming up because Carrick's suspended for that game."