I have had many people asking me if Nani is injured or not, well i can tell you that he is injured.
Nani currently has a Thigh Muscle Strain but he should return on the 19th April which is the same day as the Blackburn game (saturday 17:15KO).
There are 3 other injuries for United:
Vidic is still injured with a knee injury, he is expected to return on the 26th April which is the Chelsea match but there have been rumours that he will be fit enough to play in the away game at Blackburn on the 19th April.
Fletcher is also out with a knee injury, he will be out for longer and is expected to return on the 11th May which is basically the rest of the season.
Saha who is a regular to the injury list has a hamstring injury and we dont have a clue when he will return.

That is all of United's current injuries that i know of