GETTY Arsenal's Joel Campbell

The Costa Rica international looked to have finally made a breakthrough at the Emirates last season when he appeared 30 times and scored four goals. But he is not guaranteed a regular place in the first team and was not included in the squad which lost 4-3 to Liverpool last weekend.

Arsenal training ahead of Leicester clash Fri, August 19, 2016 Click through the gallery for the best snaps of the Arsenal squad in training Play slideshow Getty Images 1 of 10 Click through the gallery for the best snaps of the Arsenal squad in training

And Portugese newspaper O Jogo claim Arsenal and Sporting have now reached an agreement for the 24-year-old. It means Campbell will link up with international team-mate Bryan Ruiz at the Estadio Jose Alvalade.