London - Arsenal's hopes of sustaining a credible title challenge this season have been given a boost after they managed to persuade Chelsea to allow keeper Petr Cech to join one of their direct rivals.
"It's true not many players leave Chelsea for Arsenal, but the deal itself was not too difficult," Wenger said.
"The decision was difficult because I felt our two goalkeepers did very well last season, but, on the other hand, we could add experience and strengthen the belief of our squad."
Goalkeeper has long been a problem position for Arsenal with David Ospina and Wojciech Szczesny both culpable for errors last term as the side finished third.
Cech's arrival has been greeted warmly by Germany international Per Mertesacker, who will be marshalling the defensive line in front of the Czech shot stopper.
"There's even more belief now and we feel very confident at the back. There are many doubters out there, but we feel a lot stronger with Petr Cech," he said.