Neil Lennon doubts Celtic captain Scott Brown will be able to feature in both of Scotland's upcoming World Cup qualifiers against Wales and Belgium.
Brown missed out on Scotland's opening draws against Serbia and Macedonia last month due to an ongoing hip problem.
He has been recalled to the Scotland squad by Craig Levein for the games in Wales and Belgium, but could struggle to be involved in both matches.
The midfielder had to take anti-inflammatories and have an injection to take part in Celtic's 3-2 Champions League win over Spartak Moscow on Tuesday night and is struggling to be ready for the visit of Hearts in the SPL on Sunday.
Celtic boss Lennon said: "I have spoken to Craig and he knows what the situation is.
"He will go to Scotland and he will play but I don't know if he will be able to play the two games."