Diouf said: "I've done a lot of thinking over the last two days and want to apologise again to both the Celtic supporters and Liverpool supporters for my behaviour at Celtic Park.
"I've no idea why I reacted in that way and can only say it was done on the spur of the moment - though that's not meant be an excuse. I remember falling back into the crowd and someone slapping me on the back of my head. I realise now I took that contact in the wrong way, but at the time it genuinely frightened me because I had no idea what was going on behind me.
"But whatever the Celtic fan's intentions I was wrong to do what I did and I regret the way I reacted. I've since invited both of the Celtic fans who were taken away by the stewards to be my guests at Anfield on Thursday because I want to shake hands with them and tell them to their face how sorry I am.
"I sat next to the boss on the coach after the game and he explained to me that although the club would stand by me I had got it wrong big style and that sort of behaviour was totally unacceptable for a Liverpool player. He was right and I asked to apologise to the rest of the lads when we got back to the team hotel.
"I knew I'd let both them and the fans down and instead of everyone talking about a fantastic European display they would be talking about that one incident instead. Everyone at Liverpool has gone out of their way to make me feel at home since I came to England and I wear the Red shirt with pride.
"So many people have told me about the special bond between the two sets of fans and I am very upset that my behaviour might affect that special relationship. That is the last thing I want to happen. The club have since fined me - which I accept they had to - and I'm pleased that a charity in Glasgow will benefit as a result.
"I was badly in the wrong, but I will learn from this and make sure it doesn't happen again."
