Arsenal goalkeeper Wojceich Szczesny admits he needs to improve his concentration levels.
Szczesny is just 22 and despite proving himself as a brilliant keeper, he is still vulnerable to the odd clanger.
He said: "My biggest problem is not enough focus in the games without huge stakes. I can't find the spark in myself. But when the stakes are high, I'm in top gear.
"The biggest save in my career was the penalty against Udinese in the Champions League qualifiers last season.
"For one, it was a save worth £25million - that is how much you get for playing in the Champions League.
"It was the only time in recent years that Arsenal could have missed out on that tournament, which would have been unforgivable.
"That was the moment I was very much needed. It made me realise that I'm not only a good keeper, but I can have a big say on how we perform."