Hayden Coulson has joined Blackpool on loan for the remainder of the season.
The 25-year-old linked up with the League One side on Monday morning.
The Boro Academy graduate made his first senior appearance since August at the weekend when he came off the subs bench for the final seven minutes against Aston Villa.
The loan move to Bloomfield Road will be sixth of his career, having previously had spells with St Mirren, Cambridge United, Ipswich Town, Peterborough United, and Aberdeen.