Simpson has been talking about his new venture and been asked which players he might like to take on in the ring. The former Newcastle and Manchester United man was quick to point out McClean in a chat on Boxing Social.
He said: "Me and James McClean had a few little bust-ups. He's left wing, I was right-back. He wants to fight everyone so I say him because I know if he ever sees us he'll probably fancy himself. He was scrapping a bit at a Chelsea player recently in pre-season so he's still at it.
"I remember I was at Newcastle, he was at Sunderland and the two rivals and we always just had a bit, so yeah me and James McClean would probably have a good scrap."