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Boro boss Neil Warnock has previously said he wants to add a fourth striker to his squad, while the Teessiders have also looked at bolstering their defensive options.
There were also plans to send some of the club’s younger players out on loan, yet that may depend on who comes in.
Scroll down and flick through our picture gallery to see nine deals which could happen:
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1. Britt Assombalonga - Out
It seems unlikely the striker will leave the Riverside before the 11pm deadline, yet his Championship record could attract interest. Leeds and Aston Villa were reportedly monitoring Assombalonga who also has other admirers. Photo: George Wood
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2. Filip Benkovic - In
Another centre-back on Boro's radar. Benkovic will be allowed to leave Leicester on loan if the Foxes can sign a replacement. Derby, Bristol City and Celtic have also been linked with the 22-year-old. Photo: Michael Regan
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3. Stephen Walker - Out
Boro will allow the youngster to leave on loan if the right offer is made. The 19-year-old striker has fallen down the pecking order in recent months following the arrival of Lukas Nmecha and Rudy Gestede's comeback from injury. Photo: Frank Reid
4. Ravel Morrison - In
Reports emerged yesterday linking Boro with the former Manchester United prospect. According to the Sun, Morrison will be offered a short-term deal at the Riverside after joining Sheffield United in the summer. The playmaker, 26, has made just one Premier League appearance for the Blades this season. Photo: George Wood