Sam Greenwood has joined the club on a season-long loan from Leeds United.
Sam is the second completed signing of the day, following Lewis O’Brien in joining the club.
Sam adds further strength at the top of the pitch for Boro and has played as both an attacking midfielder and as a striker.
The Sunderland-born player started his career with his hometown club’s Academy, but he joined Arsenal as a 16-year-old where he spent two years before moving to Leeds in 2020.
He has made 35 appearances since joining Leeds, including 25 in the Premier League, and was handed his first team debut by Marcelo Bielsa.
Boro head coach Michael Carrick said: “Sam is a really talented player. He’s two-footed and he gives us greater flexibility.
“We’re looking forward to working with both him and Lewis O’Brien, and helping them develop as players.”