Chris Sutton has criticised Leigh Griffiths over his lack of fitness.
Celtic are preparing to face Nice, Lyon and PSG in France this week, but Griffiths has been left in Glasgow to work on his fitness.
Sutton, who scored 86 goals in 199 appearances for Celtic, is unimpressed with the 29-year-old and believes his manager will also be disappointed.
Speaking in Record Sport, he said: “Everyone knows the hard yards you need to go through in lockdown – there are no excuses. It was vital to maintain focus and stay on top of fitness.
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“The players would all have had programmes.
“It’s just stupid. Neil Lennon will feel let down. If I was a team-mate I’d feel hacked off.
"Griffiths had a huge part in Celtic winning the title. He got a lot of credit the way he came back from his problems and rightly so.
“To have fitness issues at this stage though is just unprofessional.
“It wouldn’t surprise me if he (Lennon) managed to get Griffiths back to a level again.
“A lot of that will now be down to him.
“He has to work his backside off. Griffiths has to be careful. Celtic spent a lot of money on Patryk Klimala and at some point he will get opportunities.
“There is Vakoun Bayo there as well. If there are doubts about the fitness of Griffiths though, Lennon will be thinking about buying a striker.”
