As Ashley Williams prepares to take on Swansea, where he spent eight years, Ollie Miller looks back at five stars who've done the dirty on their old sides
1. Denis Law vs Manchester United
Christened the King of Old Trafford, Law scored 236 goals in 11 years for the Red Devils. Having returned across Manchester to previous club City, he backheeled the winner against the Red Devils in the penultimate game of the 1973/74 season, as United were relegated to the second tier of English football.
The Reds would have gone down regardless, but Law wasn't to know.