Liverpool skipper Steven Gerrard will be out for the rest of the season after sustaining another groin injury.

Gerrard has not played since the beginning of March when he captained Liverpool to win over arch-rivals Manchester United. He underwent a groin operation and returned to training last week but has sustained another injury to the groin, identical to the one he was operated on.

After a week of assessment, manager Kenny Dalglish, at Liverpool's Melwood training ground, confirmed that his skipper was out for the season.

We still don't know definitively what the problem is,'' he said.We will wait to get a precise answer from the people that he has to see but he won't be involved again this season.''

It adds to Liverpool's injury worries as on Wednesday, defender Daniel Agger was also ruled out for the rest of the season with a knee tendon injury he picked up in the weekend's defeat against West Brom.

Right-backs Glen Johnson and Martin Kelly are also sidelined for one month with hamstring injuries, and the injuries are piling up at a bad time as Liverpool have a clash with Manchester City at Anfield on Monday.