Arsenal legend Jens Lehmann has warned Petr Cech that he must disconnect himself emotionally from Chelsea before he will be ready to give his all for the Gunners.
The Czech Republic international brought an end to an 11-year career at the Blues last week to join their Premier League rivals in a £10m deal.
Cech had personally requested permission to join Arsenal as he did not want to uproot his family by leaving London.
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Having won four Premier League titles amongst myriad other awards, Roman Abramovich granted him the favour and may expect him to make a significant difference in next season's title race.
However, the last goalkeeper to win the Premier League with Arsenal, Lehmann, says it could be months before Cech is psychologically ready to win things with his new club.
He told The Sun: "It's not easy to suddenly go from Chelsea, where he has spent almost his whole career winning many trophies, to the other side of the capital with a rival.
"Before you can have it in your heart to win titles again, you have to get rid of the love you had before.
"At Chelsea, for Petr, it was his passion and he showed great commitment. But, as a professional, he needs to get over it and needs to know Arsenal want him to win things again for them.
"Yet, let me tell you, that is not an easy thing to get over psychologically. It can take a few weeks, even a few months."
The signing of Cech, Arsene Wenger hopes, is expected to bring with it a catalyst for a Premier League title challenge next season.
Along with World Cup winners like Per Mertesacker and world-class stars like Alexis Sanchez, Arsenal now have a squad capable of winning major honours.
Lehmann said: "With someone in there like Petr, with Per Mertesacker now as captain, they can re-establish this winning attitude and mentality."
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