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CELTIC face a Europa League sweat over Kris Commons – because they can’t get to the bottom of his BUTT injury.

Bemused boss Ronny Deila revealed the problem last night after the talisman missed the hard-fought 2-1 win over St Mirren.

And despite being hopeful Commons will return in time to face Dinamo Zagreb on Thursday night, he could yet be sidelined.

Deila said: “It’s hard to say how much we missed him here but he has a huge impact on the team.

“He has pulled a muscle in his butt. I hope it’s from football! I hope he’s back for Thursday but I don’t know.”

The Player of the Year’s craft was definitely missed as Celts laboured to the points thanks to John Guidetti’s double.

Deila said: “It wasn’t the best performance. We looked tired and didn’t create many chances. But we’ve played three matches in six days, which is a tough schedule.”

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