Neither side was able to fashion much in the way of clear-cut chances in a frequently fractious encounter in Glasgow which leaves the tie delicately poised ahead of next week's second leg in Portugal.

"It was very frustrating - we didn't play well at all," McCoist told ITV4.

"We were as poor with the ball as we have been for a long time. But it's a clean sheet and we are capable of going anywhere in Europe and scoring a goal - as we've proved.

"We know we can play a lot better, but not losing a goal at home in the first leg is a reasonable result."

McCoist felt tonight's disappointing display may have been a result of fatigue as Gers head towards the conclusion of a gruelling campaign.

"We are a better team than we showed tonight. But you have to cut the lads a little bit of slack. But tonight, in terms of possession, we were poor," he added.

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