Kyle Bartley is very familiar with new Leeds teammate Kemar Roofe.
Kemar Roofe clinched his transfer to Leeds United last week and there are big expectations on the new signing.
While his first task will be to win the respect of his new teammates, there is one player in particular he does not need to win over - Kyle Bartley.
Bartley already knows just what Roofe is capable of, having suffered at the hands of his magic last season.
The centre-back was in the Swansea City team which were knocked out of the FA Cup by Roofe's underdog Oxford United side.
Here is a picture of the duo in action at Oxford's Kassam Stadium...
Oxford's Kemar Roofe and Swansea's Kyle Bartley in action
Bartley's Swansea were knocked out by Roofe's Oxford, who won 3-2 at home - with the new Leeds United attacker scoring two second half goals.
The defender was a contributor to the defeat, giving away a penalty for Oxford's first goal thanks to a mistimed tackle on Alexander Macdonald.
He could then do little to stop Roofe putting on a masterclass as Swansea failed to exert their Premier League superiority.
He admitted, quoted by the South Wales Evening Post: "We just didn't perform today. We didn't start well and never really got playing. It's just disappointing."
Swansea's Kyle Bartley looks dejected at the end of the game
The defeat was a chastening experience for Bartley and the rest of his Swansea players, who were at a low moment just a month after the surprise sacking of Garry Monk.
Monk has since been appointed by Leeds, and brought in Bartley on loan and signed Roofe permanently.
Bartley will surely be glad he is on the same team as the live wire attacker, and does not have to play against him again.
New Leeds manager Garry Monk