Champion boxers Jorge Linares and Evgeny Gradovich have been training at Limehouse Marina Elite ahead of clashes at The O2.
Linares, in the record books as a three-weight world champion, defends his WBC lightweight title against Londoner Kevin Mitchell at the North Greenwich venue on May 30.
And Gradovich makes the fifth defence of his IBF featherweight title against Lee Selby on the Sky Sports pay-per-view show.
Jorge said: "Limehouse Marina Elite Gym is beyond anything I have ever come across and I have used a lot of gyms all over the world.
"Next time I box in Europe I will definitely be using this gym again, I'm sure any other Golden Boy fighters fighting in the UK will also.
"The guys running the gym have paid a lot of attention to detail and the result is a first class training base."
Hellraiser Boxing's Mickey Helliet, LME's director of boxing, added: "In the past month we've had fighters from three of the world's leading promotional outfits.
"Floyd Mayweather's Gym, Golden Boy Promotions and Top Rank Boxing have all had fighters preparing for fights in our gym.
"It's great that my fighters have been able to train alongside these world class fighters and learn from watching how they prepare."
The WBC lightweight world title fight between Kevin Mitchell v Jorge Linares and the IBF featherweight IBF between Lee Selby v Evgeny Gradovich are on Sky Sports Box Office on May 30 from 5pm.
Go to limehousemarinaelite.com .