Schmidt, 52, ‌took over in September 2007 when ‌they were in the fourth tier, and in 2023 surpassed the previous record ‌of 16 years for the ⁠longest-serving pro coach in Germany.

"It was truly ​impressive to see how much effort the club put into ​securing another contract extension with me," Schmidt said in a ⁠statement.

"However, in ​recent weeks, I have come to the conclusion that it is time to make a decision. After nearly ‌20 years as head coach at FCH, I simply want to take a break this summer.

"One thing is certain: together, we at FCH have written a unique story in German professional football over many years but the ‌final chapter has yet to ​be concluded," he added.

Schmidt led the ‌club into the Bundesliga in 2023 and to a Europa Conference League appearance a year later.

Heidenheim, relegated last season, are currently ⁠sixth in ⁠the second-tier ‌standings.