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Boro have confirmed the signing of Argentinian hot prospect Pedro Silva Torrejon.

The paperwork for the protracted move for the Boca Juniors defensive starlet was squeezed through just before the transfer window closed on Tuesday.

And the highly-rated left-back, 20, has arrived at Rockliffe Park today at the start of a six month loan spell.

If his trial in the Paul Jenkin’s Academy side goes well, Boro have an option to sign him on a permanent deal in the summer.

The switch from Buenos Aries giants Boca was agreed last month but got bogged down in red tape.

Boca’s head of youth development Jorge Roffo visited Rockliffe last week as part of talks over a future partnership and helped resolve the sticking points.

Torrejon is part of Boca’s youth set up but has played twice for the senior side in the Primera Division.

Boro are also keeping tabs on his team-mates Matías Roskopf, a striker and midfielder Julian Chicco, and could bring them in next term.

Former graduates of the ‘Boca Factory’ include Carlos Tevez and one time Boro maverick midfielder Carlos Marinelli.