Mainz 05 has agreed to sign 23-year-old defender Fabio Gruber from Nürnberg for a reported fee of €3.5 million.
The acquisition is aimed at bolstering the Rheinhessen side's defensive stability.
Gruber arrives with a proven track record, having made 279 competitive appearances for Dynamo Dresden, where he played a key role in two promotions to the 2.
He most recently secured a league title in the sixth tier before his stint at Nürnberg.
The deal reflects Mainz's immediate need for a reliable defensive presence and their willingness to invest in a player with a clear upward trajectory.