Mikkel Kessler wants a third fight against IBF and WBA super-middleweight champion Carl Froch, who beat challenger George Groves on Saturday.
Kessler, 35, beat Froch in 2010 before losing his WBA belt on points in their second clash in London in May 2013.
"I'm more than ready to fight Carl for the decider," the Dane posted on his Facebook page. "I feel very confident that I will win that fight.
"[In the last fight] I started out slow. That won't happen again."
Kessler, who announced his retirement following the defeat to Froch but returned to boxing last month, said: "It's no secret I crave the big fights."
A fight with Nottingham's Froch would be the 50th of Kessler's career.