Treble-chasing Bayer Leverkusen are offering their fans free club tattoos to commemorate their Bundesliga-title winning season and record unbeaten run, the club said Friday.

Xabi Alonso's team, who are undefeated across all competitions this season, reached the Europa League final after a 2-2 comeback draw against Roma on Thursday for a 4-2 aggregate win.

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In doing so, they stretched their unbeaten run this season to 49 matches across all competitions, surpassing Benfica's long-standing European record set from 1963 to 1965.

"A special action at the end of a special season. Bayer 04 are offering fans... Until the end of the season the opportunity to choose one of the many Bayer 04 tattoos for free," the club said in a statement.

"Book your appointment now to eternalise this unique season on your skin."

Just 42 minutes after announcing the initiative, Leverkusen said that tattoo appointments were fully booked, adding that fans still had the chance to get inked at the home game against Augsburg on May 18 and at their Fan Fest in Berlin on May 25.

After sealing their first ever Bundesliga title, Leverkusen are also through to the DFB-Pokal final where they will face second-tier side Kaiserslautern in what could be a treble-winning season for the club.