EFL clubs have until October 16 to sign off domestic deals, with Boro now looking to make a few more loan additions.
There may also be a couple of outgoings in the next few weeks, with plans in place for some younger players to leave on loan.
Scroll down and flick through the pages to see some deals which could still take place:
1. Marcus Browne - Out
Despite scoring his first Boro goal against Bournemouth earlier this month, the playmaker has still made just one league appearance this season. Warnock admitted on Saturday that in an ideal world, Browne would be loaned out to gain more first-team minutes. . Photo: Jan Kruger
2. Patrick Roberts (Manchester City) - In
A deal which seems as good as done. Roberts wants to return to the Riverside after impressing on loan last season. Warnock said on Saturday the paperwork was almost complete. Photo: Naomi Baker
3. Stephen Walker - Out
A player who featured in pre-season but hasn't even been in the matchday squad so far this campaign. Another loan deal seems likely after a spell at Crew in League Two last term. Photo: Alex Davidson
4. Filip Benkovic (Leicester) - In
Boro have been looking at other centre-backs, while Benkovic is available on loan. The 23-year-old was on the Teessiders’ radar in January but moved to Bristol City instead. Leicester boss Brendan Rodgers has said the defender needs more game time. Photo: Harry Trump