Louis Saha joins Ole Gunnar Solskjaer on the sidelines

Saha sustained the problem in training for the Champions League clash with Lille at Old Trafford.

The 28-year-old's injury is a setback for United boss Sir Alex Ferguson as he faces a shortage of strikers.

Ole Gunnar Solskjaer is out for a month after knee surgery, while Henrik Larsson will return to Sweden shortly after a loan spell from Helsingborg.

606: DEBATE Your views on Man Utd's growing injury list

Saha's injury was confirmed after a scan on Tuesday, and manager Sir Alex Ferguson has already said he will not make any late attempt to extend Larsson's loan spell.

He will miss Saturday's FA Cup tie at Middlesbrough, the Premiership clashes with Bolton and Blackburn on 17 and 31 March, and, almost certainly, the first leg of the Champions League quarter final at the beginning of April.