The club is delighted to confirm that Argentinian Olympic international Martin Payero has completed his move from Argentine top-flight side Banfield.
The highly-rated 22-year-old arrived on Teesside ahead of the switch, and the formalities were completed on Thursday morning when he signed a three-year deal with the club.
Payero was put through his paces on the Rockliffe training pitches by Neil Warnock and Kevin Blackwell and will meet his new team-mates for the first time on Friday.
The central midfielder, who was attracting interest from a host of clubs on the continent, arrives at Boro fresh from the Tokyo Olympics where he featured in his country’s three group matches.
The Boro boss was delighted to welcome his sixth summer signing and he said: “Martin will be a great addition to the squad.
“I think he will be an exciting signing, we’re delighted to get everything done, and we’re looking forward to working with him.
“I know Martin is looking forward to it, and he can’t wait to play in front of our fans.”
The player has made 60 domestic appearances in Argentina, for Banfield and Talleres, and he also trained with the national squad.