Stalemate leaves Ronny ‘irritated’

“I don’t think they had a chance in the whole game, apart from maybe at the end when we got the red card, and that wasn’t really a goal chance.

“We probably had about 70 per cent possession and created a lot of chances, but we could talk about that all day long.

“It’s about scoring goals and we didn’t do that today.”

Deila admitted the constant bombardment without reward brought the name of Carlton Cole focus with the 31-year-old former West Ham striker spending five days training at Lennoxtown during the week.

But the Celtic gaffer does not know if a deal is in the offing.

He said: “You need someone who has different skills than the players we have and Carlton has that, so we will see what happens there.

“That type of player is what we have been looking for.

“At the moment he is in London. Maybe he will come back again next week. I don’t know for sure what is happening.

“He hasn’t played football for a long time so it will take time for him to get going again.

“But he has been consistent in the Premier League for a long time and he has a lot of the qualities that we are looking for in matches like today.

“He was very positive with everything about Celtic. He has been to the games here and he sees opportunities to score a lot of goals.

“We will keep on talking and see if there is going to be something or not.”

Deila revealed defender Jozo Simunovic, out again with a twisted ankle, is set to return for Thursday’s Europa League clash with Fenerbahce at Celtic Park.

Meanwhile, Hearts boss Robbie Neilson praised red-carded Efe Ambrose for taking one for the team in the final seconds, when he hauled down Sam Nicholson to end a Hearts breakaway.

He said: “Credit to Ambrose, he was very professional in what he did. It was a good one for our young boys to see.

“You are at 0-0 in the 92nd minute, you make a bad touch, the boy goes through, you take man and ball if you can, if you can’t do that you take the man and he did it and saved his team a point.

“Yes, he got a red card, but it shows the experience he has got.

“I thought we rode our luck in the first-half – we could have been 3-0 down – but you have to do that here.”