Brendan Rodgers bought Joe Allen from Swansea City last summer.
Joe Allen will not play again this season after Liverpool confirmed that the 23-year-old Wales international needs to have an operation on his left shoulder.
Allen, who moved to Anfield last summer from Swansea City, has seen his form deteriorate in the last few weeks and his discomfort was such that he had to be substituted at half-time during Liverpool's 3-1 defeat by Southampton on Saturday.
Allen, who was a key part of current Reds boss Brendan Rodgers' Swansea City side, has started 21 Premier League matches this season following his £15million move from south Wales.
Liverpool first-team doctor Zaf Iqbal said: "Joe Allen is due to have a left shoulder operation on Thursday morning in Liverpool and will be ready to return to football at the beginning of next season."
Despite losing at St Mary's, Liverpool continue to push for a top-four spot and they are 21.00 to succeed in their aim while Everton can be backed at 10.00 and Tottenham at 2.00.
Meanwhile, Rodgers has given permission for Raheem Sterling to represent England at the European U21 Championship this summer.
Rodgers is keen not to overplay the 18-year-old, who has become a first-team regular at Liverpool this season, but said: "I spoke to Stuart Pearce because we have a number of England U21 boys here and I don't think it would do Raheem any harm.
"He's had a good season and going to a tournament like that, if selected, will be good for his experience."
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