Middleweight champion Gennady Golovkin, with trainer Abel Sanchez (left) and promoter Tom Loeffler (right) at Tuesday L.A. luncheon

At first K2 Promotions’ Tom Loeffler list of opponents for unified middleweight champion Gennady Golovkin was a short one with the name Canelo Alvarez at the top.

However, this is boxing and sometimes your initial plan isn’t going to work as was the case for Golovkin’s September fight date.

“Naturally, Canelo (Alvarez) was clearly the first priority for the next fight,” Loeffler said Tuesday from The Palm Restaurant. “Especially after we were up there (in Las Vegas) for his last fight and he called Gennady into the ring, I thought, this has a pretty good chance of happening.”

“After Canelo wasn’t a possibility, we made a big offer to Billy Joe Saunders, that didn’t work out and go very far as far as the contract negotiations, then Eddie Hearn proposed (Chris) Eubank Jr. He had a fight, called out Gennady …

That didn’t get far either, but (IBF) welterweight champion Kell Brook jumped at the opportunity.

“Two hours later, Eddie Hearn called me back and said Kell would take the fight,” Loeffler said. “He wanted a big fight and he was having a hard time getting the best welterweights to fight him and that’s how this whole fight came about.”

In the ironic state that sometimes is boxing, the welterweight champion is jumping up to face Golovkin, Sept. 10 at the O2 Arena in London. The fight will be carried on HBO.

“When we announced it, it got announced first on Sky Sports in the UK and it sent shockwaves through the boxing industry,” Loeffler said. “Two undefeated fighters, the welterweight champion against the middleweight champion. We have to give Eddie Hearn and Kell Brook a lot of credit. Kell showed a lot more heart then a lot of the middleweights and super middleweights for that matter.”