Shaun Maloney has warned out-of-shape Leigh Griffiths he may have opened the door for Patryk Klimala to steal his Celtic spot after being berated by boss Neil Lennon.
The Parkhead manager has given the Scotland striker a furious dressing down after deciding he was not fit enough to travel with the Hoops to the Veolia Trophy in France.
Lennon was left angry after the 29-year-old reported back from lockdown "out of condition and overweight".
The Ulsterman has also ordered the 29-year-old - who spent much of the last four months posting light-hearted videos on TikTok - to cut out his "social media nonsense".
Former Celtic ace Maloney does not believe the row will spell the end of the former Livingston, Dundee, Wolves and Hibernian frontman's six-year stay in Glasgow.
"Leigh has to find the motivation to fight for a spot," he said.
"He has to want to be that striker they go to with Odsonne Edouard. The motivation has to be there.
"Klimala scored last night (against Nice). He came in in January and he's worked incredibly hard during the break. It's another person's opportunity. That's what happens in team sports. Things don't wait."