Simunovic was carried off in the early stages of Celtic’s Europa League defeat against Molde, and he has not played since.
However, the Croatian’s injury is not thought to be a serious one, and Deila is hoping to welcome him back into contention for the Bhoys’ next match against Kilmarnock.
“A proper look at the injury showed that it was nothing too big which was good news for us,” said Deila. “Jozo will be back after the time away with the national team.
“He has shown leadership and character when he has played with us and I think we need leaders in this environment. Of course, it has been disappointing that we have not been able to see more of him because we would like to have been able to develop a strong partnership with his and Dedryck Boyata, and that takes time.
Simunovic was brought to Celtic during the summer transfer window, as Deila looked to reinforce his side’s backline following the departures of Jason Denayer and Virgil van Dijk.
However, his start at Parkhead has been disrupted by his inability to stay off the treatment table.
Simunovic has picked up a series of injuries since joining Celtic, but he will be hoping to get a prolonged run in the side when he does return to fitness.
Simunovic’s inclusion should improve Celtic’s defence, as Deila’s side have still not settled upon their first-choice back-four this term.