The Gunners agreed a fee with Sampdoria for his services before the World Cup began, but Torreira held off completing the move until he was home from Russia, to allow him to focus on the tournament.
Starting his youth career in Uruguay with I.A 18 Julio and then Montevideo Wanderers, Lucas moved to Italy in 2013 where he joined Pescara. He made his debut there as an 19-year-old in May 2015.
In July 2015, Lucas signed for Sampdoria, but remained at Pescara for the 2015/16 season to gain further first-team experience, making 29 appearances during the campaign.
He returned to Sampdoria before the 2016/17 season and during his time with ‘La Samp’ made 71 appearances, becoming a first-team regular and an integral part of the side.
Lucas, who will wear the number 11 shirt, has been at the club for a medical and will now have a post-World Cup break and join up with the squad in early August