Arsenal completed the signing of Willian on a three-year deal on Friday after the Brazilian winger’s contract at Chelsea expired.
The 32-year-old won two Premier League titles, an FA Cup, a League Cup, the Europa League and was voted the club’s players’ player of the year twice during seven years with the Blues, but moves across London on a free transfer with Chelsea unwilling to offer the multi-year contract he desired.
“I believe he’s a player that can really make a difference for us,” said Arsenal boss Mikel Arteta.
“We had a clear intention to strengthen in the attacking midfielder and the winger positions.”
“He is a player that gives us a lot of versatility – he can play in three or four different positions,” added Arteta.
“He has the experience of everything in the football world but still has the ambition to come here and contribute to bring the club where it belongs.
Willian made 339 appearances for Chelsea after signing from Russian side Anzhi Makhachkala for £30m in 2013.
Arsenal finished eighth in the Premier League last season, while Chelsea were fourth and secured a Champions League spot.