Van Nistelrooy, then a PSV Eindhoven player, was successfully operated upon by Steadman after sustaining ligament damage during a training session.
Following his arrival at Real from United in 2006, Van Nistelrooy has scored 45 league goals including four this season.
He top-scored in the 2006-07 season with 25 goals in 37 games and is the second top-scorer in the Champions League with 60 goals.
Real, the reigning Spanish champions, are currently fourth in La Liga but crashed out of the Spanish Cup on Tuesday, losing to third division side Real Union on away goals after drawing 6-6 over the two legs.
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