Celtic have underwhelmed in Europe in recent campaigns.
Celtic skipper Scott Brown has spent 11 seasons at the club.
Brendan Rodgers’s Celtic won against Graeme Murty’s Glasgow Rangers in the Old Firm derby, with Odsonne Edouard scoring twice.
Moussa Dembele and Leigh Griffiths have only registered 17 league goals in between them this season.
Celtic face Rangers at Hampden Park on Sunday afternoon in the Scottish Cup.
Scott Bain remains on loan at Celtic from Scottish Premiership minnows Dundee.
Scottish Premiership rivals Celtic and Ibrox side Glasgow Rangers renew hostilities in Sunday's Old Firm in the Scottish Cup.
Pat Bonner suggests that Glasgow Rangers' Alfredo Morelos can't consider himself a "top striker" after his Ibrox woes today.
Celtic travel to Russia for the second leg against Zenit on Thursday night.
Brendan Rodgers’s Celtic won against Partick Thistle at Celtic Park in the Scottish Cup on Saturday.