Arsenal have completed the signing of Uruguay international Lucas Torreira from Sampdoria, the Premier League club have announced.

Torreira, 22, becomes Arsenal’s fourth acquisition since Unai Emery was appointed as head coach in May.

The defensive midfielder has cost the Gunners a reported £27million and follows Stephan Lichtsteiner, Bernd Leno and Sokratis Papastathopoulos in joining the north London club this summer.