Arsenal have signed Brazil winger Willian on a three-year deal, the Premier League club said on Friday.
The 32-year-old joins Arsenal on a free transfer after failing to agree on a new long-term contract with Chelsea.
Willian scored 63 goals in 339 appearances for Chelsea after his arrival from Russian club Anzhi Makhachkala in 2013.
Twice a Premier League winner with the Blues, he will add experience to an Arsenal side full of talented youngsters in Bukayo Saka, Joe Willock, Gabriel Martinelli and Reiss Nelson.
"I believe he's a player that can really make a difference for us," Arsenal manager Mikel Arteta said in a statement on the club's website.