Saul 'Canelo' Alvarez has insisted he will face pound-for-pound king Gennady Golovkin and believes he would have no problem moving up to 160lbs to take on the Kazakh.
Alvarez returns to the ring to challenge WBO super-welterweight champion Liam Smith this weekend in Texas after destroying Amir Khan in six rounds last time out.
The Mexican gave up his middleweight title ahead of his fight with Khan in May which led to accusations of him ducking 'GGG'.
However, Canelo (47-1-1-KO33), whose sole defeat was to Floyd Mayweather via a points decision, is adamant he wants the fight and says the undefeated knockout specialist should be the one to be worried.
"Any day, any time. When the negotiations are done and the fight is done, I will be ready. They need to worry about it, not me," said Canelo.
"I'm not worried at all about going to 160lb. I'm a strong fighter, I'm a fighter who can adapt to my surroundings.
"I can't tell you now what I will be like at 160 as I don't know yet. We will see in a couple more fights in how I feel and look. We will see what comes.
"I will say this one more time. They need to worry. They need to make something happen."
Golovkin stopped Kell Brook in five rounds last weekend to claim his 36th straight win and 33rd by stoppage.
"I have always known what he has and what he does not. He had an opponent who moved a little and we saw what we saw," added Canelo.
"I have never worried about him or others. I just want to create my own history. I have been fighting the best, I am just 26 and have fought in the biggest arenas.
"I have no regrets, I want that fight and it will happen."
However, the former WBC, WBA and the Ring super-welterweight champion and WBC middleweight champion must first deal with undefeated Smith at the home of the Dallas Cowboys on Saturday night.
"I expect a tough fight against Liam Smith, he is coming to win and style-wise it will match. It will be different to the Amir Khan fight - the styles are different, this is a tough, hard fight. He throws combinations and can take punches."