Several names have been linked with the Teessiders over the last few weeks, while Warnock has admitted loan deals are the most likely before the deadline.
We’ve taken a closer look at some of the rumours which have been going around and the likelihood of them happening – scroll down and flick through our picture gallery to find out:
9. Kenneth Zohore (West Brom)
Warnock worked with the striker at Cardiff so a loan move to the Riverside looked like a possibility a few weeks back. That was before Boro signed Chuba Akpom, though, while Zohore's wages may also have proved a stumbling block. Sheffield Wednesday were heavily linked with the forward, while Derby have reportedly entered the race to sign him, yet the 26-year-old remains a West Brom player. Photo: Stephen Pond