Celtic hero Charlie Nicholas feels midfielder Aaron Mooy 'looked off the pace' against St Mirren.

The Bhoys lost 2-0 in Paisley in what was Ange Postecoglou's side's first league defeat in just under a year.

It was a tough day for the Australian, who was subbed off at half-time after a lacklustre performance.

He started for the first time in the Scottish Premiership but struggled to have an effect on the game.

And now the ex-Arsenal striker feels the Parkhead boss will regret the squad rotation he chose to undertake in Paisley, he also highlighted David Turnbull, who also did not have his best day.

Writing in his Scottish Daily Express column, Nicholas said: "The Hoops were way below their normal standards.

"Ange Postecoglou made the wrong changes and admitted as much after the game.

"The players who came into the starting line-up didn't deliver, David Turnbull in particular. He didn't contribute the way he has to.

"Matt O'Riley and Reo Hatate are the guys ahead of him in the pecking order, so when Turnbull gets his chance he has to take it - and he didn't do that in Paisley.

"I also feel that every time Aaron Mooy has come into the side he looks a yard off the pace. He needs more minutes and a run of matches but I'm not sure he's going to get them.

"For the first time this season there is a question mark over this Celtic team and Ange will need to address it."