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.
8. Derby County
IN: | OUT: Jayden Mitchell-Lawson (Bristol Rovers, loan), Max Hunt (Carlisle), Jonathan Mitchell (Macclesfield, loan), George Thorne (Oxford United)
9. Fulham
IN: Bobby Decordova-Reid (Cardiff), Ivan Cavaleiro (Wolves), Terence Kongolo (Huddersfield, loan), Jordan Archer (free) | OUT: Tayo Edun (Lincoln)
10. Huddersfield Town
IN: Richard Stearman (Sheffield United), Emile Smith Rowe (Arsenal, loan), Andy King (Leicester, loan), Harry Toffolo (Lincoln) | OUT: Reece Brown (Peterborough, loan), Ryan Schofield (Livingston, loan), Rarmani Edmonds-Green (Swindon, loan), Terence Kongolo (Fulham, loan), Adama Diakhaby (Nottingham Forest, loan), Aaron Mooy (Brighton)
11. Hull City
IN: Herbie Kane (Liverpool, loan), Martin Samuelsen (West Ham), OUT: Mallik Wilks (Barnsley, loan), Brandon Fleming (Bolton, loan)
12. Leeds United
IN: Elia Caprile (Chievo), Ian Poveda (Manchester City), Jean Kevin-Augustin (RB Leipzig, loan) | OUT: Lewie Coyle (Fleetwood), Conor Shaughnessy (Burton, loan)