Simon Cowell, who recently expressed his intention to retain last year's panel, believes Dixon could step in if Kelly Rowland does not commit to another series.
"It's a possibility that Alesha will be asked to be an X Factor judge if her stint on Britain's Got Talent is successful," a source told the Daily Mail.
"Simon originally wanted Alesha instead of Kelly to join the judging panel last year, but she backed out and decided to stay loyal to Strictly and the BBC," the insider went on.
"In a way, Alesha's better suited to The X Factor because she is in touch with popular music and has had hit singles, as a solo artist and a member of her old band."
Former Mis-Teeq member Dixon defected to ITV from BBC One's Strictly Come Dancing in January.