The 25-year old English gloveman has made his name with the Scottish champions, joining permanently from Newcastle United in 2012, after two successful season-long loans.
With his brilliantly consistent Scottish Premier League performances and impressive displays in the UEFA Champions League, Forster is bound to be a target in the next transfer window and Lennon believes he may be out the exit door at the end of the season.
"We received no bids for Fraser in the January window," Lennon said.
"I think there will be something in the summer for him but he seems happy here and content.
"I wouldn't be surprised if something happens in the summer or we get offers then."
Lennon added: "Fraser is in fine form so he's got the bit between his teeth, as do the whole team.
"We've been lucky over the years to have two superb keepers in Artur Boruc and Fraser.
"We waited a long time for a world-class goalie then got one with Artur.
"You think it might be another long wait then Fraser comes along and progresses into a world-level goalkeeper.
"He has done amazing things here. Getting into the England squad and winning a cap while in Scotland speaks volumes for him.
"Everyone will have their own thoughts but I don't think there's too much between Artur at his peak and Fraser at his peak."
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