The midfielder is a major doubt for the Scottish Premiership side's Champions League clash.
Welcome to this morning's transfer round-up. This edition features 'Blaise Matuidi linked to Manchester United again' and 'Tottenham said very interested in Pau López Sabata' plus more, so delve in below.
West Ham are reportedly keen on Palermo star Achraf Lazaar.
Manchester United, Liverpool and Burnley are said to be on alert, following Leeds United defender Charlie Taylor's transfer request.
Sunderland boss David Moyes has admitted he held talks with Celtic.
Grant Ward has left Tottenham Hotspur to join Ipswich Town in the summer transfer window.
Daryl Janmaat has been linked with a move away from Newcastle United in the summer transfer window.
Pablo Hernandez is a Leeds United player.
Psychologist Angela Duckworth says having "grit" is key to getting ahead. She outlines four traits that mentally strong people share.
West Ham United are set to play their first ever game at the Olympic Stadium on Thursday night and one of their new signings has been having his say.
Manchester United and Feyenoord go head-to-head on Thursday night.
Liverpool target Sardar Azmoun scored as Rostov beat Bayern Munich 3-2 this evening.
Chelsea should be wary of losing Dominic Solanke to Manchester United.
Former Newcastle maestro Hatem Ben Arfa provided an assist for PSG against Arsenal.
Tottenham Hotspur have won just once in their last nine outings.
Celtic started Callum McGregor against Barcelona in the Champions League last night.
Roy Keane thinks Celtic should look towards Dutch football for some new signings.
The West Ham United forward would have plenty of motivation to excel.
Pundit says Tottenham would not have made the same mistake as West Ham.