Barnsley goalkeeper Heinz Muller is poised to return to Germany with newly-promoted Bundesliga side FSV Mainz 05.

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Muller has spent the last two seasons at Oakwell following free transfer from Norwegian side Lillestrom and quickly established himself as one of the best goalkeepers in the Championship.

But the 31-year-old, who has reportedly agreed a three-year deal with Mainz, lost his place in Barnsley's starting line-up to Luke Steele in the last four matches of the season.

Mainz general manager Christian Heidel told Frankfurter Rundschau newspaper: "Everything is said, this is a done deal."

Steele has ended speculation over his future by signing a new deal with the South Yorkshire side.