Daniel Fox admits Celtic have been below par for most of the season following their blistering display against Aberdeen on the opening day.
The Bhoys put the Dons to the sword in the first half of their season-opener, but Fox admits those lofty standards have not been repeated.
Although Celtic beat St Mirren 2-0 at the weekend and lead the SPL table six games into the new season, he wants his team-mates to raise their game - himself included.
Celtic tackle arch-rivals Rangers in their next league fixture, however, the former Coventry defender insists Tony Mowbray's side are not looking past Thursday's Europa League clash against Rapid Vienna.
"The gaffer sets high standards and was right to let off steam because we fell beneath what was acceptable to him," explained Fox.
"Fingers can be pointed at me on a personal basis for the way I played and I can't argue with that, but what better time can there be to come back and do better?
"I can't begin to think about Rangers now because if ever there was a case for taking one game at a time then this is it. We can't look beyond Rapid Vienna.
"We need to gel more as a team and the only positive I could take out of winning this match was that we managed to keep a clean sheet.
"The first half against Aberdeen on the opening day of the season at Pittodrie, when we were three goals up, was the last time the team played really well.
"There were little flashes of good play when we took five goals off St Johnstone at Celtic Park but we haven't been as good as we were on the first day.
"I have to accept we fell beneath the expectation level that's associated with Celtic when we played St Mirren. We got the victory and that was about it, apart from Paddy McCourt's great goal."