Former Celtic player Chris Sutton says the board have to either back Ronny Deila or sack him.

The Norwegian manager has come under criticism for his sides poor European results and tactics – and rightly so because he has been naïve at times.

Defensive errors and injuries haven’t helped the cause either but some fans have already had enough.

Despite winning two trophies in his first season and a poor decision away from a chance at the treble, Deila has come under fire like no Celtic manager has before.

Below standard performances this season have Celtic in a better position than this time last year, and once the players hit form they will open up a bigger gap to Aberdeen.

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Sutton is used to the winning feeling from his Celtic days, and is part of a niche group of players to win a domestic treble, a feat which has only happened three times in Celtic’s history.

The former striker has called on the board to either give Deila the funds to improve the team to get back to the Champions League or sack him now.

As quoted by the Glasgow Evening Times, Sutton said:

If Peter Lawwell makes the decision to keep him there is no point in not backing him, because he is hanging him out to dry even further.

If you keep him get behind him and give him the tools he needs.

If they were going to relieve Ronny of his duties this was the time to do it.

It would make more sense to get someone in now and let them get the feet under the table so it’s not the scattergun approach in the summer where you get someone in you are asking unfairly to make an instant impact in the biggest games of the season.

Sutton also had a go and some of the abject performances this season, which has seen Celtic win just three of their last eight games in the absence of skipper Scott Brown.

I think there’s an air among the supporters of being resigned at the minute to bang average dross at times.