Arsenal have announced on their official website that striker Joel Campbell will join Portuguese Primeira Liga side Sporting Lisbon on a season-long loan.
The Costa Rican has never managed to secure a regular place in Arsene Wenger's squad.
Since moving to the Emirates, he was loaned out to Lorient, Betis, Olympiakos and Villarreal.
A club statement said: "The forward will be hoping he can help the Portuguese side win the Primeira after their second-placed finish last year and gain further Champions League experience.
"Everyone at Arsenal wishes Joel a successful season in Portugal.
"The move is subject to international clearance and formal ratification."
