The 28-year-old has a contract until 2028 but is understood to be seeking a new challenge, and West Ham are simultaneously preparing a contract renewal offer in a bid to keep him, according to reports in England. The two situations point to a summer in which his future will be a central storyline at the London Stadium.
Mavropanos would be returning to familiar territory. He made 89 appearances for VfB Stuttgart before joining West Ham in 2023 for €20 million and knows the Bundesliga well. His profile — aggressive, right-footed, commanding in the air — fits the type of defender Dortmund need.
The need is real. Niklas Süle is departing at the end of the season, and Nico Schlotterbeck's long-term future remains uncertain despite his recent contract extension, which contains a release clause of between €50 and €60 million valid until mid-July. Liverpool, Real Madrid and one unnamed club are reportedly eligible to trigger it.
According to Sky, West Ham are valuing Mavropanos at €30 million. Whether Dortmund are willing to match that figure is the key question. Other Premier League clubs are also monitoring the defender, adding competitive pressure to the pursuit.
Mavropanos has been one of West Ham's standout performers in the second half of the season under Nuno Espírito Santo, playing a major role in what has been a genuine survival fight. His 41 caps for Greece and experience across two major leagues make him one of the more complete central defenders available this summer.