Arsenal boss Arsene Wenger is watching Borussia Dortmund defender Neven Subotic.
Wenger, despite welcoming former Villarreal stopper Gabriel Paulista in January, hopes to add another centre-half to his squad this summer.
German sources say he is turning to Serbia defender Subotic as a potential addition.
English speaker Subotic, USA raised, has long been linked with a move to the Premier League.
Subotic has lost his first-choice status at BVB this season and is still waiting to hear from management about a new deal.
The defender's current agreement runs to 2016.