“We probably had about 70 per cent possession and created a lot of chances, but we could talk about that all day long.
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.
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.
“At the moment he is in London. Maybe he will come back again next week. I don’t know for sure what is happening.
“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.
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.
“Yes, he got a red card, but it shows the experience he has got.