Having beaten Barcelona in the group stages, Forster admits that a number of the Bhoys players could be snapped up by some of Europe's top clubs at the end of the season.
"There have been some fantastic performances and various performances will have caught the eye throughout the competition," said Forster. "We'll just have to wait and see what happens in the summer. I wouldn't be surprised if one or two faces leave but no doubt we'll bring in a few as well."
Asked for his highlight of the campaign, Forster said: "It's got to beating Barca at home. That's obviously something special with the atmosphere and something that might only happen once in a lifetime.
"But we're a very ambitious squad and we're all hoping for more nights like that."
Celtic advanced in second place in the group stages ahead of Benfica and Spartak Moscow.