The 'Start Without You' singer recently visited the Manchester United training ground - home to her favourite football team.
"Meeting Man United was so cool and to see what they do on a day-to-day basis was amazing," she told The Star.
"If they need a cup final song I'll be there. I just need to persuade Syco to let me do it."
McFly's Danny Jones recently revealed that he was asked to write a football anthem for Bolton Wanderers by their chairman.