Paulo Costa responds to Bogdan Guskov's callout

Paulo Costa has responded to a callout from Bogdan Guskov on social media. The post indicates Costa acknowledged the challenge, though specific details of his response are not provided in the original message. This represents potential movement toward a middleweight bout between the two fighters. Guskov has been actively seeking high-profile opponents, and Costa represents a significant step up in competition. The post contains minimal detail beyond confirming that Costa's response has been made public.