And the Black Cats have plucked hidden gems from League Two before – with the popular Luke O’Nien cementing himself as Phil Parkinson’s first-choice right-back and fan favourite.
Here, we take a look at the top-performing players from the fourth tier that Sunderland could sign when the transfer window opens.
9. NATHAN THOMAS - Carlisle United
The 25-year-old Sheffield United loanee has impressed during his stint in League Two. Could Sunderland attempt to persuade the Blades to let Nathan Thomas make a similar loan move to the Stadium of Light? His performances with Carlisle United suggest he'd be worth a punt for Phil Parkinson. Photo: Pete Norton
10. RYAN BROOM - Cheltenham Town
The 23-year-old Welsh centre-midfielder has flourished in League Two having been released by Bristol Rovers at the end of the 201718 season, chipping in with eight goals in 34 appearances. Photo: Pete Norton
11. EION DOYLE - Swindon Town
Although his age may count against him, the 32-year-old Irishman enjoyed a stellar campaign, netting 26 goals in 34 appearances, making Eion Doyle top scorer in League Two. The striker also boasts extensive experience in both League One and the Championship. Could he be the man to provide an unlikely solution to Sunderland's goal-scoring problem? Photo: Dan Mullan