Eboue Kouassi is facing two months out of action.
The midfielder was injured during the first half of the League Cup win over Kilmarnock and was sent to a specialist in London alongside Dedryck Boyata who was getting a check up.
“Kouassi will have an operation on Thursday,” Rodgers told The Herald. “Two of the players went to London to have check-ups on where they are at.
“Boyata is good news. He comes back and he’ll be back in early September. Kouassi will have an operation on his ankle.
“The knee is stable, but there was a bit at his ankle similar to what Tom Rogic had and it puts him out for six to nine weeks. It is a shame for the boy because he was doing so well.”
Kouassi has had little luck since he joined Celtic in January from Russian side Krasnodar.
Within a week of arriving in Glasgow he was treated for malaria which delayed his debut before another injury saw him miss out on Celtic’s pre-season friendlies in Austria and the Czech Republic.
Boyata was ruled out for three months after injuring his knee against Slavia Prague with that blow compounded by an injury to Erik Sviatchenko.
That combination has left Brendan Rodgers with only Jozo Simunovic as a first choice central defender with Nir Bitton expected to continue in defence tonight against Astana.
Moussa Dembele is expected to be be back in action early in September after recovering from a hamstring injury.
