Marcelo Bielsa feels his side is strong enough to maintain their Premier League promotion charge, however look set to face competition from an emerging pack - including the likes of Nottingham Forest and Fulham. Scroll down and click through the pages to see EVERY deal done in the second-tier this month ahead of Friday's deadline.
13. Luton Town
IN: Peter Kioso (Hartlepool) | OUT:
14. Middlesbrough
IN: Patrick Roberts (Manchester City, loan), Lukas Nmecha (Manchester City, loan), Dejan Stojanovic (St Gallen) | OUT: Marcus Browne (Oxford United, loan), Marc Bola (Blackpool, loan), Darren Randolph (West Ham)
15. Millwall
IN: Ryan Wood (Stoke, loan), Bartosz Bialkowski (Ipswich) | OUT: Tom Elliott (Salford), Jason McCarthy (Wycombe, loan)
16. Nottingham Forest
IN: Adama Diakhaby (Huddersfield, loan) | OUT: Jack Robinson (Sheffield United), Jordan Gabriel (Scunthorpe, loan), Claudio Yacob (Nacional)
17. Preston North End
IN: Scott Sinclair (Celtic) | OUT: Josh Earl (Ipswich, loan), Josh Ginnelly (Bristol Rovers, loan), Chris Maxwell (Blackpool)
18. Queens Park Rangers
IN: Jack Clarke (Tottenham, loan) | OUT: Josh Scowen (Sunderland), Nahki Wells (recalled by Burnley)