Emma hosts the singing competition alongside fomer JLS singer Marvin Humes, and the two have been praised by critics for breathing new life into the show when they took over presenting duties for the third series.
Show bosses are now worried that they may lose Emma to ITV, with The Mirror claiming that producers would be willing to shell out a hefty sum to make sure she stays put.
A show insider told the newspaper: "The production team have been really impressed with Emma. She’s been key to the success of this series. They don’t want to lose her to ITV so they will make an offer she can’t refuse."
Emma already presents from 'The Hub' on the daytime show, in addition to her role as host of 'Celebrity Big Brother' on Channel 5.
It was reported back in March that Kylie Minogue - who also joined 'The Voice' this year, along with Kaiser Chiefs frontman Ricky Wilson - may not be able to return to be a mentor, as filming dates clash with her forthcoming tour.
However, producers have already said that they are willing to accommodate Kylie's schedule should she want to come back as a judge on the singing competition.