Click your way through the gallery, and see where all the players Sunderland bought and sold back in the 2009/10 campaign are now...
1. Frazier Campbell - Bought from Manchester United
His injury troubles meant his time at Sunderland was a difficult one, and he was sold to Cardiff City in 2013. He's now playing for Huddersfield Town, and is looking to reignite his career with the Terriers. (Photo by James Chance/Getty Images) Photo: James Chance
2. Paul McShane - Sold to Hull CIty
The Irishman spent a solid seven seasons with the Tigers, and could be looking for a new club after being released by Reading last season. (Photo by Nathan Stirk/Getty Images) Photo: Nathan Stirk
3. Matthew Kilgallon - Bought from Sheffield United
The Leeds United youth academy product spent four seasons with Sunderland, but left to join Blackburn Rovers in 2013. He was last on the books at Hamilton. (Photo credit: LINDSEY PARNABY/AFP/Getty Images) Photo: AFP
4. Greg Halford - Sold to Wolverhampton Wanderers
He barely featured for the Black Cats before joining Wolves. He went on to be a Championship mainstay with various sides for the following decade, and was last at Aberdeen. (Photo by Stu Forster/Getty Images) Photo: Stu Forster