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Speaking at an offtheball.com event, the Englishman described how it was him who prompted a fight between Celtic and Porto players in Seville, a match which Martin O’Neill’s side lost 3-2 in extra-time.

Celtic went into the interval 1-0 down after Derlei had netted an stoppage time opener. The goal and subsequent frustrations angered the Celtic players with Thompson targeting the then Porto boss Mourinho.

Alan Thompson started a fight with Jose Mourinho by squirting Lucozade in his face. Picture: SNS/Bill Murray

He said: “I didn’t realise that when Porto scored the goal just before half-time, Derlei scored, he ran past the Celtic bench (punching his chest). I didn’t know that. So that’s obviously got tempers fraying a little bit before the whistle goes.

“There’s a bit of a fracas down the tunnel. He’s piped up, Mourinho. I’ve got a Lucozade in my hand because I’m thirsty and just went straight over Moruinho and it’s all kicked off. I sprayed the Lucozade in his face and it got even worse, more people were piling in, then I thought I better run. So I ran, got in the dressing room and no one is there. I’m sitting thinking ‘where the hell is everyone’.

“So I obviously threw the hand-grenade, started everything off and bolted.”

It was a revelation which surprised Thompson’s Celtic colleague Jackie McNamara who was speaking at the same event.

“To this day I thought Mourinho instigated a fight,” McNamara said. “I didn’t know he done that. We’re all fighting, he’s done that and effed off and s**t himself, we’re all scrapping in the tunnel.

“To this day I genuinely thought Mourinho instigated a fight, because they had scored just before half-time I thought he was trying to get his players knowing we are going to come out in the second half and they need to get up for this.”

Ex-Celtic star Alan Thompson started Jose Mourinho fight with Lucozade