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Celtic have suffered a Champions League blow after Tom Rogic was ruled out of next week’s first-round clash in Sarajevo.

Neil Lennon admitted he has been forced to give the Aussie playmaker time to rest up after battling an ankle injury all summer.

Rogic was left behind for the Parkhead men’s pre-season camp in Austria while Kieran Tierney headed back to Glasgow on Saturday.

Arsenal are ready to launch a fresh bid for the Scotland defender after a £15million offer was rejected last week.

But Lennon insisted Tierney returned home to step up his Celtic rehabilitation.

The Hoops boss said: “Tom picked up an ankle injury in Scottish Cup Final and we knew he would be out for several weeks.

“To be fair to the kid, he probably needed a rest.

(Image: Getty Images)

“He could do all his rehab work at home. We hope that by the time we get back Tom will be back training.

“We will get him back up to speed and that will do him the world of good.

“Kieran has gone back home too, to finish off his rehab.”

Lennon is thrilled his summer shopping spree has gathered pace. Defender Christoper Jullien will join the squad in Switzerland while

midfielder Luca Connell met up with the group in Vienna yesterday.

(Image: SNS Group)

Lennon said: “It’s coming together slowly but surely but we knew it would take a bit of time.”

Celtic’s pre-season continued with a 2-1 win against Wiener SK in Austria that saw £2m striker Vakoun Bayo get off the mark for the Hoops.

Leigh Griffiths also scored and Lennon said: “I’m pleased with Bayo – it might do his confidence the world of good.

“We could have won the game by seven or eight goals. I was delighted with the way the game went. There are no injuries and the players have 45 minutes in their legs as we move on to St Gallen on Tuesday.”