Granit Xhaka has left Arsenal to join German side Bayer Leverkusen in a 25m euro (£21.4m) deal.
The Switzerland midfielder, 30, has signed a five-year deal with the Bundesliga club.
Xhaka, who joined the Gunners in 2016 and was briefly captain in 2019, had a year left on his contract but was expected to leave the club this summer.
Arsenal are on the verge of signing England midfielder Declan Rice in a British record deal from West Ham.
Xhaka scored 23 goals in 297 appearances for the Gunners, helping them win the FA Cup twice and finish runners-up in the Premier League last season.
He scored twice during the final game of the season, a 5-0 home win against Wolves, before being given a standing ovation as he was substituted late on.