Wolves midfielder Ben Marshall will undergo a medical at Millwall ahead of a move to The Den, according to Sky sources.
Marshall is expected to join the Lions on loan for the remainder of the Sky Bet Championship campaign.
Manager Neil Harris has already added defender Jason Shackell and midfielder Tim Cahill to his squad this month.
Marshall has featured just nine times for Wolves this season, with his last appearance coming back in November in a 2-0 win over Fulham.
The 26-year-old, who has previously played for Blackburn, Leicester and Sheffield Wednesday, has two-and-a-half years remaining on his contract at Molineux.
Marshall previously attracted interest from Championship strugglers Sunderland.