Paulo Costa responds to Bogdan Guskov's callout

Paulo Costa has responded to a callout from Bogdan Guskov on social media. The post indicates that Guskov publicly challenged Costa to a fight, and Costa has now acknowledged the challenge. The nature of Costa's response and whether he accepted or declined the bout is not specified in the available details. This exchange adds another potential matchup to the middleweight division's ongoing narrative. Further information about the specific terms or timing remains limited.