Celtic manager Brendan Rodgers says it's unclear how long Patrick Roberts will be out injured for.
The winger was substituted early on in their 1-all draw with Kilmarnock in the Scottish Premiership.
Rodgers did tell Sky Sports News, he'll definitely miss Tuesday's Champions League game against Bayern Munich.
He said: "It looks like a hamstring which is unfortunate for him because he started the game very well but we will get a scan on it and see for definite.
"He felt it go so we will see how serious it is."