Charlie Nicholas believes time "must be up" for Leigh Griffiths at Celtic after his cameo role in the draw with Rangers on Sunday.
The Scotland international came on for the final two minutes plus added time of the 1-1 draw and barely managed a touch.
Though he's hit 122 goals in 254 games for the club it's been a stop-start season for Griffiths.
He reported back unfit for pre-season training and is yet to complete 90 minutes.
Since Neil Lennon 's departure the striker has been given just eight minutes of action by interim boss John Kennedy, and Nicholas feels his Celtic career is now over.
He wrote in his Daily Express column: "Leigh Griffiths' time at Celtic must be up now.
"His team was drawing against Rangers on Sunday and in need of a goal, yet he was only sent on in the 88th minute.
"What does that tell you? Griffiths must be embarrassed.
"Things have gone into meltdown for the 30-year-old in the last three months.
"When it was a big game and Griffiths was on the bench, you always thought he could come on and score a free-kick or a long shot from nowhere.
"The fact he only got a handful of minutes at the weekend doesn't look good.
"A new manager could come in and accept Griffiths, left, but I just can't see it.
"I don't understand why the striker isn't doing everything he can to kick Steve Clarke's door down and make sure he is in the Scotland squad ahead of this summer's Euros."
