 On 24 September Gustavo played his first game in First Professional Football League (Bulgaria) and scored a goal for the 3-0 win in the derby game against Lokomotiv Plovdiv.On 11 May 2018 Gustavo had a controversial performance during the 2-1 win over Beroe Stara Zagora.He assisted for the first goal of João Paulo da Silva Araújo but later on was sent off for committing a brutal foul against Matheus Leoni.