It would be wrong to concentrate solely on Evra's misdemeanour. In the crazy month that is January, when clubs are offering inflated prices for players, the 27 year old has been one of the few successes to come in at this stage of the season.
It three years since Evra joined United for a fee of around £5.5million from AS Monaco.
After his first game, against Manchester City, United fans must have wanted to send him straight back.
He was hauled off at half-time in their 3-1 defeat and it took the Frenchman some time to adapt. But Ferguson kept faith with him and he has responded by becoming one of United's most consistent players ever since.
His return will be a big boost for the Reds. The versatile John O'Shea has done a commendable job in his absence but Evra adds another dimension.
He is a very good defender who won't get beaten for pace and relishes any one-on-ones with opponents. His lack of height is not a problem either as his positional sense is so good and he gives players a little 'nudge' to put them off if he can't win headers cleanly.
But he really comes in to his own going forward. When United have the ball he plays like a winger, getting forward as much as possible and, unlike a lot of widemen, his final ball is excellent.
He is the perfect modern-day full back. Quick, strong in the tackle and a good defender who loves to get forward.
While many might be watching the more celebrated stars in Sunday's game, United's left back may prove to be the matchwinner.
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