Speaking to Digital Spy, the actress backed the reappearance of her character Michelle Connor's son Ryan in Weatherfield.
"People have been asking me whether Ryan is coming back, because that's been one of the rumours recently," she told DS.
"I really have no idea at this stage, but I'd love Ryan to come back. I think it'd be great to bring back that dynamic and maybe see how he's changed."
Thompson, who starred on the show between 2006 and 2010, was phased out by current producer Phil Collinson in 2010.
Elsewhere in the interview, Marsh suggested Coronation Street execs are still yet to decide whether off-screen husband Jamie Lomas has won the part of Carla's long-lost brother.
"All I can say is that Jamie was one of several people that Coronation Street wanted to look at for the part," the 35-year-old stated.
"Jamie is very busy with other things at the moment, so whether it would be right for him and right for them is still not clear, so we'll see."
> Read our full interview with Coronation Street's Kym Marsh here