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Middlesbrough FC want to make Borussia Dortmund defender Neven Subotic their next signing after completing a deal for ex-Barcelona goalkeeper Victor Valdes.

The Serbian defender has been in talks with Boro's top brass about a possible summer move to the Premier League.

Boro have already strengthened their defensive ranks with the addition of out-of-contract Sporting Gijon centre-back Bernardo Espinosa, but see the 27-year-old Serbian as an ideal new recruit.

Subotic announced last month that he will leave Dortmund this summer, and is understood to have already looked around the Riverside ahead of a possible £8m move.

The uncompromising centre-back, previously linked with Liverpool and Sunderland, could become Boro's sixth signing of the summer - should talks continue to progress well.

Boro tonight confirmed the signing of ex-Barcelona and Manchester United stopper Valdes , who has signed a two-year deal.

The Spaniard follows Viktor Fischer, Espinosa, Marten de Roon and Jordan McGhee into the Riverside, as Boro prepare for their first season in the top-flight since 2008/09.