Goalkeeper Tomas Mejias has sealed a return to Middlesbrough after one season at Cypriot club Omonia Nicosia.
The 30-year-old, a product of the Real Madrid youth system, has signed a two-year deal keeping him at the Riverside Stadium until June 2021.
Mejias amassed 17 appearances during four years at Boro between 2014 and 2018 before being released last summer.
He served as a regular understudy to Dimitrios Konstantopoulos, Victor Valdes and latterly Darren Randolph, who he will be expected to play second fiddle to once again in the upcoming Sky Bet Championship campaign.
The Spanish stopper featured in famous away victories over Manchester City and Manchester United, when he saved penalties from Wayne Rooney and Ashley Young to help Boro through to the quarter-finals of the 2015/16 League Cup.
Mejias is a familiar face to both head coach Jonathan Woodgate, his one-time captain at Boro, and Leo Percovich, who was goalkeeping coach during Mejias' first stint with the club.
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