Charlie Nicholas has said Leigh Griffiths' time at Celtic “must be up” after his late cameo appearance in Sunday’s Old Firm.

After only being subbed on for the last two minutes plus added time, Griffiths had no chance to make an impact in the 1-1 draw which saw Rangers hold on to their unbeaten league run this season.

Without a full 90 minutes under his belt all campaign, and only five goals and two assists in his 20 appearances so far, Nicholas has called time up on Griffiths' Parkhead career.

Current interim boss John Kennedy has only given him seven minutes on the park since Neil Lennon was sacked, casting further doubt on the Scotland striker's future at the club.

Speaking in his Daily Express column, Nicholas said:  "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 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."