The 35-year-old's contract is due to end in the coming weeks but he is expected to carry on presenting the show through the summer.
Speculation over future changes to the presenting line-up has been rife in recent months, fuelled by the news in March of Penny Smith's departure and this week's announcement that Adrian Chiles is joining the show.
But sources close to the ITV programme said Ben had indicated some time ago that he was planning to move on, before the deal with Adrian was signed.
Ben, who also presents revitalised 1980s game show The Krypton Factor, is understood to be in discussions about fronting other shows for the broadcaster.
Meanwhile, fellow GMTV presenter Kate Garraway is undergoing hospital treatment for appendicitis. Her spokeswoman said that she had been taken to hospital on Monday.
Colleague Emma Crosby has stepped in while Kate recovers and programme makers are waiting to find out how she is getting on. "She is expected to be back in a week or so," the spokeswoman said.
Adrian Chiles's new ITV job is understood to be worth around £1 million a year and will see him front GMTV and present ITV's football coverage after signing a four-year deal.
He quit the BBC after blasting the corporation for tinkering with The One Show.
The 43-year-old is said to be unhappy at Chris Evans being drafted in to host the Friday night edition of the programme.