Shkodran Mustafi has handed Arsenal an injury scare barely 24 hours after his arrival.
The Sun says the centre-back lined up for Bastian Schweinsteiger's final-ever game against Finland, but was left on the ground clutching his ankle in pain early in the second half.
Mustafi was able to continue gingerly, but the extent of his potential injury remains unknown.
The former Everton man joined Arsenal from Valencia for £35million on Tuesday, hours after a deal was struck for Espanyol striker Lucas Perez.
Mustafi is expected to slot in beside Laurent Koscielny at the heart of Arsenal's defence this season, but his apparent setback could put his Gunners debut on hold.