Isac is a young promise in the middle blocker position who was lapidated since the youth teams by Rubinho – Brazil’s national team assistant coach – in São Bernardo team (SP). The player had already been called to help in the training sessions of the adult national team and, in 2013, was also called to become part of the team. In his first year, Isac was present in the World League runner-up and the conquest of the Pan American Cup and Pan American Championship. Isac was part of the team that won the silver medal in the FIVB World League. The South American title was conquest by the middle blocker and his teammates in the 2015 year. In the next year, Isac was part f the team that achieved the silver medal in the FIVB World League. In 2017, he was part of the team that won the South American Games and the FIVB Grand Champions Cup. He helped the green and yellow team climb the podium at the FIVB 2018 World Championship in second place.