United have options at right-back in the shape of John O'Shea, Gary Neville and Rafael da Silva as they prepare for a tough finale to the season.
They face Manchester City at Old Trafford on Sunday in the first of four remaining Premier League matches that will decide if they claim a third successive title.
They then face Barcelona on 27 May in the Champions League final.
Brown has endured a long list of injury problems since making his United debut in the 1998-1999 Treble-winning season, including missing the whole of the following campaign with a cruciate knee injury.
He also broke his ankle playing for United in a Champions League match in 2002.
Despite this, he has impressed enough to sign a new contract in 2008 which keeps him at the club until 2012.
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