The 25-year old England international may emerge on the radar of some clubs in January after some more impressive displays in the Champions League, prompting Lennon to suggest that he may need to make a big call at some point.
"We don't always have to sell but if somebody comes in for Forster with big money then what do you do? The player might want to go," he said.
"Players might want to try something different but they might not get the Champions League. Players have made their reputations here, no question about that. They owe the club something back. I don't want any player to leave on a Bosman."
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