Former super-middleweight champion Mikkel Kessler has announced his retirement.
The Dane, 35, says he does not feel "motivated" to extend his 17-year professional career after his promoter failed in attempts to arrange rematches against Andre Ward and Carl Froch.
Kessler, who says he will continue his training regime, has not fought since losing to Froch on points in May 2013.
"I consider myself in a state of retirement," he wrote on Facebook.
"I said I would like nothing more than to avenge my loss against Andre Ward and also to have the decider against Carl Froch.
"These are fights that motivate me but, for one reason or another, they do not want to fight me."
Kessler won his first world title in 2004 when he defeated Manny Siaca to claim the WBA super-middleweight crown, and beat the previously unbeaten WBC Champion Froch in April 2010.
The four-time champion suffered three defeats in his 49-fight career, the first coming against Joe Calzaghe in a unification bout in November 2007 in Cardiff.
Kessler also lost to Ward in the Super Six World Boxing Classic in November 2009, and went down to Froch on an unanimous points decision in the May 2013 rematch in London.