Sykes ( 28 - 5 - 6KO ) was attempting to rebound from being knocked out in the second round of his bout with Olympic gold medallist Luke Campbell in March .
Sykes ( 28 - 5 - 6KO ) says he is no longer motivated to compete .
Sykes ( 28 - 5 - 6KO ) was attempting to rebound from being knocked out in the second round of his bout with Olympic gold medallist Luke Campbell in March , but says he is no longer motivated to compete .