Paulo Costa responds to Bogdan Guskov's callout

Paulo Costa has responded to a callout from Bogdan Guskov on social media. The Brazilian fighter acknowledged Guskov's challenge through his social media channels. Details about Costa's specific response or whether he accepted or declined a potential matchup are limited in the original post. The brief nature of the announcement suggests this is an ongoing social media exchange between the two middleweights. No official fight booking or further context about the potential matchup has been provided.