Paulo Costa has responded to a callout from Bogdan Guskov on social media. The Brazilian middleweight acknowledged Guskov's challenge with a reply on his social media platforms. Details of Costa's specific response or the nature of the exchange are limited in the post. The interaction suggests potential interest from both fighters in facing each other. No official fight has been confirmed between the two middleweights. This represents another chapter in social media-based fighter callouts and responses.