Celtic boss Ronny Deila felt his side were guilty of sloppy defending in Saturday’s 2-1 defeat to title rivals Aberdeen.

The Parkhead side went ahead when Leigh Griffiths was pulled back inside the box by Andrew Considine, with the striker stepping up himself to score from the spot in the first half. Considine was awarded a yellow card, but Griffiths felt the Dons defender should have been dismissed.

Aberdeen levelled from the spot 10 minutes after the restart and the hosts then saw Jonny Haynes dismissed, but they still managed to take all three points as Paul Quinn grabbed a late winner.

Deila indicated he also felt Considine should have been shown a red card but he offered no excuses for the loss and blasted his side’s defending after the defeat.

When asked about the Considine penalty, Deila said: “When you see it, Leigh is straight on to goal. But they had a man sent off and we had a chance to win the game or at least get one point and that is disappointing.

“I am very disappointed with the result. We had control of the game until their penalty and I thought it was a very cheap one. It is a very easy penalty.

“But after the red card, I was very disappointed that we conceded a goal so easy on a set-piece.”

Aberdeen have won all six of their Scottish Premiership fixtures to date and they have a two point lead over Deila’s side, who have also played a game more.

Celtic turn their attentions to the Europa League on Thursday when they face a tough trip to Dutch giants Ajax. The Scottish giants are 4.20 to come away with a win, while Ajax are 1.83 and a draw is 3.50.