On the right of the picture above, former Rangers striker El Hadji Diouf can be seen squaring up to Celtic manager Neil Lennon.
There was no love lost between the pair, or Diouf and anybody connected with Celtic, during his spell in Scotland, and even today the Senegalese forward bears a grudge.
Lennon was not a fan of him, but was there more to it than that?
The two first met when Lennon was a player back in 2003, when Diouf was at Liverpool - pictured below.
In an interview with French publication So Foot, reported by the Daily Record, Diouf explains that after the game, Lennon asked to trade shirts with him, and he refused.
He insists he does not regret his snub, and has no positive feelings towards the current Bolton Wanderers boss.
He said: "At the end of the Liverpool-Celtic game in the UEFA Cup he asked me for my shirt but I never gave it to him.
"I would still not give him it today."
Lennon would be less inclined to ask for it today, especially after further comments Diouf went on to make about him.
He said: "I didn’t know Neil Lennon but saw his face and have always hated him. He was at Celtic and I was at Rangers and the two clubs were at war with each other. He is a d***head and I’ve never liked him."
Diouf has not played in the UK since being released by Leeds United in 2014, and played for Rangers on loan in 2011, joining from Blackburn Rovers.