The transfer window for Premier League and Championship clubs is now shut, but League One and Two’s deadline remains open until September, 2 with Jack Ross in the market for a left-back to replace Bryan Oviedo and Reece James and compete with Denver Hume.
Meaning Sunderland could target players from clubs who need to offload fringe players.
Scroll down and click through the pages to see the options available.
1. Danny Fox - Wigan
The 33-year-old veteran featured sporadically for the Latics last season. Reaching the twilight of his career, Fox may be eager to start games and Wigan have several left-back options.
Photo: George Wood
2. Sylvain Deslandes - Wolves
The 22-year-old France under-20 international is unlikely to break through at Premier League Wolves - meaning the left-back is likely seeking another loan move
Photo: Jan Kruger
3. Cameron Borthwick-Jackson - free agent
The ex-Manchester United man is a free agent and was last seen training with Sunderland's pre-season opponents Heerenveen. However, that arrangement has now ended.
Photo: AFP Contributor
4. Joe Mattock - Rotherham United
Mattock will be regarded as one of League One's better left-backs after coming down from the Championship last season. Sunderland may have to pay a sizeable fee should they wish to land him.
Photo: Nigel Roddis