With question marks over the long-term prospects of both Manuel Almunia and Lukasz Fabianski, Arsenal boss Arsene Wenger may have decided he simply must bring in a top keeper for next season.
Adler, 25, played for Germany in their crucial World Cup qualifiers aganst Russia and Finland last year.
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Widely considered to be one of the best keepers in Europe, he is contracted with Leverkusen until 2012, but Arsenal could make their move according to German newspaper Bild.
Meanwhile Brentford loan star Wojciech Szczesny has vowed to become Arsenal's number one next season.
The Polish international has starred in his five-month stint at Griffin Park, with Bees boss Andy Scott keen to keep him.
But Szczesny has set his sights on a first-team spot with the Gunners, saying:'I'm going to go back there and fight for the number one spot.
'I believe I'm good enough to do a job for Arsenal and if I'm given a chance I'm sure I'll take it.
'Hopefully I will eventually become Arsenal's number one.'
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