The Hoops fended off two bids from Norwich City for their prolific striker Hooper in the January transfer window, while shot stopper Forster has been tipped for an England cap.
Lennon’s side are set to face Serie A holders Juventus in the first leg of their Champions League last-16 tie on Tuesday, and the Celtic boss believes his players have benefited from their exposure in Europe’s premier club competition.
“Every player has a price and we will have to sell eventually. Then you have to start again,” said Lennon.
“Fraser is excellent. In my opinion, he is England’s best keeper after Joe Hart – although I am biased. Gary is good enough to be in the England squad.
“I think Roy Hodgson will come up and watch the two of them on Tuesday. Credit to Roy as he is prepared to do that. Some managers would shut the door on the SPL, but the Champions League has been so important for those two guys.
“To get two players in the England squad would be fantastic.”