The 29-year-old appeared to have hit Fournier with an elbow in the second round, knocking the 40-year-old to the ground after he had started to come into the fight .
There was little mention of that after the fight with KSI instead squaring off against Tommy Fury.
After his win over Jake Paul in February, Fury entered the ring and the two squared off before being broken up by security after pushing.
Of a potential meeting between the two, KSI said: “I want to do what Jake Paul couldn’t, I want to knock you out.”
Fury, meanwhile, described the prospect of meeting the YouTube star as “easy money”.
“You didn’t beat a professional boxer tonight, I’m a professional boxer.”
It was another dramatic night at London’s Wembley Arena, with the popular Salt Papi losing to Anthony Taylor in something of a shock.