Celtic boss Ronny Deila described Nir Bitton's sending off against Partick Thistle as a "little bit stupid" but hailed the 1-0 win as "vital."

The Israel midfielder was booked by referee Stephen Finnie for a foul on Stuart Bannigan in the 61st minute and survived another challenge on Abdul Osman moments before he got his second yellow card for a late barge on Jags substitute Gary Miller.

Leigh Griffiths grabbed a late winner after coming on as a second half substitute for Nadir Ciftci and Deila spoke about the relief at claiming three points.

Asked about Bitton's dismissal, the Norwegian said: "I think it was very easy, I don't think it was a red card.

"Having said that, it was also a little bit stupid because there was an incidence before that.

"I don't think that was a yellow card either and then the other one, those two together made the decision for the referee.

"I think it was inexperience and something he needs to learn from."

After failing to win any of his previous four home matches, and taking one point from his last six, Deila admitted the victory over Thistle was "vital" although he claimed happiness rather than relief was his overwhelming feeling.

He said: "You can call it that (relief), I will call it happiness. I am so happy that we scored and got three points.

"It was vital of course, it is about confidence as well. "You could see that we were a little bit anxious out there, the angles and pressing weren't as normal.

"They were a good passing team, they kept the ball well and we couldn't really get into the game.

"When Leigh came on we were the more dangerous, he went behind them and in the end got the chance we needed to win the game."