Let It shine will see the search for five vocalists to appear in a new West End musical based on the songs of Take That.
The new BBC One talent series follows similar previous musical talent shows with Andrew Lloyd Webber, such as Any Dream Will Do and Over the Rainbow, although Gary's show appears a lot more glitzy and glamorous.
And apparently, Simon reckons it may be a bit too similar his shows The X Factor and Latin American talent show La Banda.
The Daily Mail reports that Simon has "put a team of staff on standby to monitor Barlow’s eight-week series".
A supposed 'friend' of Simon's is quoted as telling the newspaper: "Let It Shine is all very similar to The X Factor. There are people who will be watching closely and Simon is ready to launch legal action.
"There’s no love lost between them so Simon has no qualms holding Gary to account or protecting his business interests."
However the BBC responded to the report: "Let It Shine is an original format and bears no resemblance to any other format around the globe."
Speaking on Channel 4's Chatty Man Christmas special last weekend, Gary himself insisted that Let It Shine wasn't intended to rival The X Factor.
"No. No, not at all, this whole thing came from the idea of the musical," Gary explained. "I thought wouldn't it be a great thing to put this on TV and let the audience decide who this band should be."
Gary will be joined on the show by fellow former X Factor judge Dannii Minogue and Spandau Ballet star Martin Kemp.
Hosted by Graham Norton and Mel Giedroyc, Let It Shine begins on BBC One this Saturday night from 7PM.