Bolton chairman Phil Gartside confirmed the action:
"The club does not tolerate such behaviour from its players and we had no alternative but to evoke the maximum fine against El Hadji Diouf," said Gartside. "Bolton Wanderers takes great pride in its very proactive family image and the incident has left a sour taste. We do not condone the actions taken by the player and for that he has been severely punished."
Serial gozzer Diouf who is on a season-long loan from Liverpool has issued an apology:
"I deeply regret my actions and wish to publicly apologise to Arjan De Zeeuw and Portsmouth football club. I have let down my manager, Sam Allardyce, and team-mates. I am a role model to many thousands of fans throughout the world and my behaviour showed a lack of moral responsibility to the public who support me. I am deeply sorry and embarrassed about the incident."
This the fourth time that Diouf has been accused of spitting during a match, twice at opponents and twice at supporters.
Portsmouth's De Zeeuw held his cool: "I was a bit sunned and I could not believe it. I did get a bit temperamental, but I was not going to get sent off although I did feel like punching him."
"It was cowardly and I have said already that I would rather he punched me in the face. I will leave it to the Football Association, everyone has seen it and I am sure he will get some stick."