The club has completed the signing of Fulham winger Neeskens Kebano on loan until the end of the season, subject to EFL clearance.
The 28-year-old is a deadline day capture for Boro boss Neil Warnock as he strengthens his squad and increases his attacking options for the Championship run-in.
Kebano is a double promotion winner with Fulham, having played a part in their 2018 and 2020 elevations to the Premier League.
Prior to joining Fulham, where he has made almost a century of appearances, Kebano started his career with Paris Saint-Germain before spells with Caen, Charleroi, and Genk.
Kebano is also an international team-mate of both Britt Assombalonga and Yannick Bolasie for DR Congo, and has scored six goals for his country.
Warnock said: “It’s a deal I didn’t think would happen. We’ve been after Neeskens for a few weeks now and we’ve managed to get it over the line which is a real plus for us.
“Mendez-Laing and Yannick are both lacking match fitness whereas Neeskens has been involved and playing. He’s another string to our bow and we’re looking forward to him joining us.”
He follows Jordan Archer, Yannick Bolasie, Darnell Fisher, and Nathaniel Mendez-Laing in joining the club during the January transfer window.