Reports emerged at the weekend suggesting that Crummey slept with the Tottenham Hotspur striker six weeks ago after having a previous fling last July.
Crummey claimed that Defoe 'preyed on her vulnerability', but he responded yesterday (May 13) on Twitter to deny the allegations and insult Crummey's appearance by comparing her to comedian Peter Kay.
"I've allegedly been having a relationship with Peter Kay," he said.
"Sorry to say I'm not attracted to Peter (dry those eyes) here again is an example of someone trying to make money off of my back, the fact of the matter is it doesn't matter what people try to do you can never break my spirit, God loves me and so do my family and true fans #blessed."
He added: "More importantly it's a massive game today woke up feeling like I was at [Defoe's former Sunday League team] senrab waiting for the cup final #COYS."
Defoe came on as a substitute and scored his side's second goal on their final-day 2-0 victory over Fulham, but Arsenal's 3-2 victory away at West Brom meant that Spurs finished fourth, below their North London rivals.
X Factor winner Burke and Defoe are rumoured to have started dating in February and were said to have stayed together despite reports of Defoe having an affair with 23-year-old model Laura Brown.