Inter confirmed on Twitter that midfielder João Mario moved to Lisbon Sporting on a one-year loan.
The 27-year-old moved to Inter in the summer of 2016 and this is the third loan from Inter for the European champion.
He also played for West Ham and Lokomotiv from Moscow on a temporary basis.
Since moving to Inter, Mario has played 69 matches in which he scored four goals and gave 13 assists for the Nerazzurri in all tournaments.