UFC chief Dana White dismissed Kamaru Usman's desire to fight Canelo Alvarez after the boxer beat Caleb Plant.
Alvarez, 31, dominated Plant before knocking him out in the 11th round, becoming the first ever undisputed super-middleweight champion by doing so.
He is undefeated since 2013 and now holds five belts, and although Usman maintained his flawless UFC record on the same night, .
When asked what he thought of Usman calling out Alvarez for a fight earlier this week, White responded: "I watched the Canelo fight tonight.
"He doesn't want to fight Canelo, he doesn't want to fight Canelo.
"C'mon man let's stop this s***."
Alvarez is ranked as the best pound-for-pound boxer in the world by Ring magazine.
And although Usman, 34, has a height advantage over the world champion, and knock-out power, it would be a big step to swap the Octagon for the ring.
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But after dominating the Welterweight division with 14 straight wins the Nigerian is keen to face a different challenge.
Alvarez, however, believes Usman is merely looking for a "payday" and shrugged off his suggestion of a fight.
Usman defeated Colby Covington for a second time in UFC 268 on Saturday - his fifth defence of the 170lb belt.