PER MERTESACKER admits Arsenal need to develop greater mental toughness if they are to ever win the Champions League.

The Gunners were knocked out for the fifth consecutive season at the last-16 stage last night.

Arsene Wenger's side won 2-0 at Monaco but went out on away goals after their 3-1 loss at the Emirates three weeks earlier.

Individual errors were to blame for Monaco's second and third goals in the first leg and Mertesacker acknowledges that concentration lapses are costing them.

"In the first game, we didn't have that mental level you need to compete at the highest level," Mertesacker said.

"That was missing but you could see on Tuesday night in Monaco how good we are as a team and how well organised we can be.

"We need to consider that every day in training and in games, that is why we are so far away from winning the Champions League.

"It is the last 16 and Monaco were underestimated by a lot of people, but they deserved it by playing well in the first leg.

"We had one bad game and that is enough to get knocked out.

"In the first leg, we conceded that late goal which was overall the killer, so it is really disappointing for us."

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