Leigh Griffiths and Erik Sviatchenko have both set off for Norway for the Champions League qualifier against Rosenborg after missing the first leg through injury.
The pair trained with their team-mates at Lennoxtown on Tuesday morning before checking in at Glasgow Airport for the flight to Trondheim.
Griffiths is expected to play some part at the Lerkendal Stadion, although he is not certain to start.
Leigh Griffiths travelled with Celtic on Tuesday after missing the first leg of tie with Rosenborg
Erik Sviatchenko (left) was another player on the plane to Norway despite missing the home tie
Celtic assistant manager Chris Davies said: 'Leigh will be travelling with us. He has been working hard to get back.
'He is available for selection, as is Erik Sviatchenko (who is) coming with us as well.
'He (Griffiths) has obviously not been training all the time in the last few weeks, but he has had some good rehab, has worked very, very hard and he is available for us, which is a big boost.'
Celtic played without a recognised striker in the goalless first leg of the third qualifying-round tie.
Moussa Dembele is out for several weeks with a hamstring injury and Griffiths was suspended for one match, but the Scotland striker would have missed the game with a calf problem anyway.
Asked if he expected Griffiths to play in Norway, Davies said: 'I think so, yes, without giving away too much whether he is going to start