Paulo Costa responds to Bogdan Guskov's callout

Brazilian middleweight Paulo Costa has responded to a callout from Bogdan Guskov. The nature of Costa's response is not detailed in the original post, which only confirms that he acknowledged Guskov's challenge. No additional context about whether Costa accepted or declined the potential matchup is provided. The post is brief and lacks specifics about what Costa said or his stance on fighting Guskov.