Celtic midfielder Kris Commons has admitted that he is "extremely disappointed" after his side came away with nothing against AC Milan in the Champions League on Wednesday.

The Serie A outfit scored twice late on as an Emilio Izaguirre own goal and a Sully Muntari strike proved enough to give the Rossoneri a 2-0 win at the San Siro.

Commons believes that the Scottish champions must get a result in their next European clash against Barcelona.

"You don't often see a team able to play as well as we did at San Siro and lose 2-0," Commons told reporters. "We created a few chances but we didn't take them and now we are extremely disappointed.

"If we had got that goal, we would have had a big chance to win. Milan did not create many chances and when they did, [Fraser] Forster was always up to the task.

"Our next match is against Barcelona and we run the risk of finding ourselves with no points after two games. Last season we beat them but Barcelona are the best team in the world, so it will be extremely difficult for us."

The Bhoys beat the La Liga champions at Celtic Park last season in the competition.