The former West Ham and Leeds United defender, 34, has long insisted that he wants to stay with the current Premier League leaders.
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"Rio has had a great season, he has managed himself the right way and we have contributed to that in the preparation we give him.
"He doesn’t play every game in the same way that Ryan doesn’t play every game. Two weeks ago, against Real Madrid, Rio was excellent. We need to get him ready for the big one on Tuesday."
United host Jose Mourinho's Spanish champions in the second leg of their Champions League round of 16 tie at Old Trafford on Tuesday, having earned a 1-1 draw at the Bernabeu in the first leg.
Before that, the Red Devils have the chance to extend their lead at the top of the Premier League table to 15 points over rivals Manchester City by defeating Norwich at home on Saturday.