Granit Xhaka has completed his £21.5million move from Arsenal to Bayer Leverkusen on Thursday.
The Switzerland central midfielder has agreed a five-year contract, the day before the English club hope to finalise a club-record £105m deal for Declan Rice.
Xhaka, 30, played 297 times in all competitions for the Gunners, scoring 23 goals, after signing from Borussia Monchengladbach in summer 2016.
Briefly captain for the north London side, he had a year left on his previous contract but was expected to leave in this transfer window given Arsenal's move for Rice and their desire to raise funds.