.jpg?crop=3:2,smart&trim=&width=640&quality=70&enable=upscale)
The Black Cats are searching for as many as five new arrivals during the winter trading period, with Parkinson set to make his mark on the squad after some disappointing resuls of late.
But who could be arriving at the Stadium of Light? Scroll down and click through the pages to see who has been linked with Sunderland:
25. Jamie Murphy (Rangers)
Football Insider claimed that as well as Docherty, Sunderland are also keen on his Rangers teammate Jamie Murphy, who is available this month. He subsequently joined League One rivals Burton Albion on a half-season loan. | Getty Images Photo: NEIL HANNA
26. Oliver Norburn (Shrewsbury Town)
Sky Sports revealed that Norburn was one of the midfield players on Parkinson's radar this month, but the Shrews are understood to be reluctant to lose their captain. | Getty Images Photo: Catherine Ivill
27. Will Vaulks (Cardiff City)
The Daily Mail claimed that Sunderland, Stoke and Bristol City were keen on Welsh international Vaulks, but Parkinson is believed to be targeting other players this month. | Getty Images Photo: Alex Livesey
.jpg?crop=4:3&trim=&width=640)
28. Nathan Harker (Newcastle United)
The young stopper is currently training with Sunderland, and is a potential recruit for the under-23 side. | Getty Images Photo: Getty Images