Middlesbrough are close to bringing in Jed Wallace from Millwall, after seeing a bid rejected.
Millwall, Middlesbrough and Queens Park Rangers could all be involved in late window deals.
The Sheffield United boss has confirmed his side's past interest in Millwall's Wallace, who was owned by Wolverhampton Wanderers until July.
Millwall signed Jed Wallace on a permanent basis from Wolverhampton Wanderers after an impressive loan spell in 2016/17.
Leeds United lost against Millwall at The Den in the Championship on Saturday afternoon.
Former Wolverhampton Wanderers winger Jed Wallace has started the season in brilliant form for Millwall.
Jed Wallace is all set to leave Wolves in the summer transfer window.
Michael Zyro and Jordan Graham look set to return to action for Wolves while the Millwall loanee considers his future.
How many of Wolves' loaned-out legion should have been kept at Molineux?
Millwall lost against Tottenham Hotspur in the FA Cup at the weekend.
Gregory's teammate Jed Wallace is on loan at The Den from Wolverhampton Wanderers.
Wolves turned the game around against Birmingham as they secured a memorable 3-1 victory over their rivals. From the win, what did we learn about Wolves?
The midfielder has struggled to make a consistent impact at Molineux.