Liverpool have confirmed that captain Steven Gerrard will be sidelined for up to four weeks after undergoing surgery to correct a groin injury.
Gerrard missed the club's Europa League defeat to Braga on Thursday and did not even travel to Portugal with his Liverpool team-mates.
He has now been operated on and the club expect him to be absent for around one month.
A club statement on Friday read: "LFC can today confirm that Steven Gerrard has undergone successful surgery on his groin and will be out for up to four weeks. The decision was made following consultation with a specialist."
The news means Gerrard will miss England's Euro 2012 qualifier against Wales on March 26.
Meanwhile, midfielder Lucas says Liverpool must be patient with record signing Andy Carroll, who made his second appearance for his new club in the loss to Braga.
"Andy won every single ball in the air and that gave us a chance to step up,'' Lucas said. "He provides another option because as well as being able to play on the ground we have a target man who can hold the ball and score goals.
"We are happy with what he did against Braga but he has been out for a few months and it would be unfair to put any pressure on him.''