Lucas Leiva is to undergo a scan following the knee injury he suffered against Chelsea, according to Liverpool manager Kenny Dalglish.
Lucas, 24, has been one of Liverpool's best performers this season but was stretchered off in the Carling Cup quarter-final victory over Chelsea following a challenge with Ryan Bertrand and now requires a scan.
"He's damaged his knee," Dalglish said. "We don't know what it is. We'll get him looked at and take it from there.
"We don't know what it is so rather than speculate we are best waiting until we get the proper diagnosis tomorrow or the next day and we'll let everybody know in due course. He needs to get it scanned."
Any injury setback to Lucas is a blow given Liverpool's impressive form and a lack of cover for their defensive midfielder.