Celtic boss Neil Lennon is confident of finding a new centre-half signing.

Thomas Rogne broke down in their Co-operative Insurance Cup semifinal victory over Aberdeen yesterday.

Lennon is hoping chief executive Peter Lawwell can sign another defender soon.

"He (Rogne) was feeling his calf," Lennon said. "He may have a calf strain so we'll see how he is tomorrow.

"The club have been pretty diligent in trying to get a centre-half in.

"That will just reinforce their efforts to get one in who we have identified. We hope we can cross the line."

But he added: "I'm not (optimistic), there are no guarantees about anything at this stage of the season.

"Clubs want to hang on to their players because they are either going for promotion or trying to avoid relegation or win trophies, so it's difficult."