Frank Warren has had a rough go since splitting with Sky Sports and going with his own subscriber network BoxNation, and the hits just keep on coming. George Groves will be announcing today that he's left Warren's stable to join Eddie Hearn's Matchroom Boxing, which has taken over Sky, and at this stage has to be considered the top promoter in the United Kingdom.

Groves (16-0, 12 KO) is expected to return on the Froch-Kessler II undercard on May 25 at the O2 Arena in London. He had previously been set to fight on March 16, a card that is starting to look very shaky with talk of Ricky Burns-Miguel Vazquez not happening, and Dereck Chisora having yet to go before the British Boxing Board of Control to receive a new license.

The 24-year-old Groves, trained and managed by Adam Booth, signed with Warren in August 2011, passing up a chance then to join the Matchroom team instead. At the time, it was a bit of a story that Groves had joined the Warren ranks, as he'd be in the same promoter's camp as longtime rival James DeGale, and now, less than two years later, Warren has lost both of those talented young fighters, along with Kell Brook. Brook joined Matchroom, while DeGale went with Hennessy Sports for their Channel 5 deal.

Groves last fought on December 15, when Warren brought a recently retired Glen Johnson back to the ring for a 12-round blowout.