The Germany international has an expiring contract with his current club, and will reportedly continue his career at the Imtech Arena next season after falling out of favour
The 27-year-old shot stopper has an expiring contract at his current club and has no intention of signing an extension at Leverkusen after having lost his starting berth to Bernd Leno.
Hamburg have been linked with the Germany international for months now as they are looking to replace Jaroslav Drobny between the sticks, and it appears to be a matter of time before Adler puts pen to paper.
Both parties have allegedly already agreed terms, and Adler is expected to sign his contract in the upcoming 48 hours.
Adler is a product of the Leverkusen youth academy and has made over 150 official appearances for the BayArena outfit.