Paulo Costa responds to Bogdan Guskov's callout

Paulo Costa has responded to a challenge from Bogdan Guskov. The Brazilian middleweight acknowledged Guskov's callout through social media. The details of Costa's response are limited in the original post, which simply confirms that the exchange between the two fighters has taken place. This interaction suggests potential interest in a matchup between the two middleweights, though no official fight agreement has been announced.