Cristhian Stuani has joined Spanish club Girona.
The Uruguayan international completed a return to La Liga after flying out to the Catalan club on Friday to finalise the deal.
Stuani scored 16 goals in 66 appearances for Boro after being signed by Aitor Karanka during the summer of 2015.
The 30-year-old, who netted 11 goals during our promotion season, scored the decisive goal against Brighton in May 2016 to lift the club into the Premier League and he also netted twice in the 2-1 win at Sunderland last season.
Stuani links up with Colombian defender Bernardo, who made the same switch from Boro earlier this summer.
Due to a privacy clause within the transfer deal we are unable to make the fee public.