Manchester United winger will miss Manchester United's Premier League match against Aston Villa after picking up a hamstring injury.
The Red Devils star, whose future at the club is uncertain at the moment, suffered the problem during Wednesday's 3-1 win over Braga in the Champions League and faces a week-and-a-half on the sidelines.
"Nani is out with a tight hamstring. It will be about 10 days," said Sir Alex Ferguson.
"Jonny is a doubt," Ferguson went on to say. "It is not a serious one. We are monitoring it and hopefully he will be OK."