"It's a massive blow - Martin has been a great player for us since he arrived at the club," said the vice-captain.
"We didn't know much about him when he first came to the club, but he's done very well. He has cemented himself in the Liverpool team quite quickly - which is a very tough thing to do.
"It's just unfortunate for him that it's such a bad injury but obviously it gives someone else a chance to get a run in the team.
"That's why you need a big squad in a long season and credit to the manager as well, he's seen that we didn't have enough players in that area of the pitch at times last season and we have Hyypia and Agger who can come in now."