The Teessiders moved into the Championship play-off places over the weekend but their squad remains low on numbers as they approach the second half of the campaign.
Loan deals appear the most likely way Boro will be able to sign players – so scroll down to see five Premier League wingers who may be available:
1. Yannick Bolasie (Everton)
An obvious one to start. Boro almost signed the 31-year-old in October but a deal wasn't completed in time. Bolasie will be keen to leave Everton and has spoken about his good relationship with Neil Warnock.
Photo: Nathan Stirk
2. Kamil Grosicki (West Brom)
Boro have been linked with the Polish international who almost signed for Nottingham Forest during the last transfer window. Grosicki had made just one Premier League appearance under Slaven Bilic at West Brom and wasn't on the bench for Sam Allardyce's first game in charge.
Photo: David Rogers
3. Anthony Knockaert (Fulham)
Knockaert signed for Forest on loan at the start of the season, yet the deal is set to expire in January. If the Frenchman does leave the City Ground, he may want to sign for a team who are competing for a play-off place.
Photo: James Williamson - AMA
4. Jack Clarke (Tottenham)
After joining Spurs from Leeds in 2019, the 20-year-old has made just two appearances in the Europa League for the North London club. Clarke moved to QPR on loan last season and may be suited to a return to the Championship.
Photo: George Wood