Rafael Greca, the former mayor of Curitiba, officially left the PSD party and joined the MDB on September 19, 2023, announcing his pre-candidacy for the government of Paraná. This transition was made public through a video shared on social media, where Greca expressed his intentions while flanked by key leaders including Alba Rossi, the national president of MDB, and Sérgio Souza, the president of the party in Paraná. Greca thanked his former party, PSD, while also indicating his continued support for Ratinho Junior, a prominent local political figure and the current governor of Paraná.

In his announcement, Greca emphasized the importance of democracy and the need for unity over political polarization, indicating his commitment to public service and the collective good. He stated, "I return because, deep down, I never left. I choose MDB because I believe that democracy should always come first," which reflects his desire to play a significant role in the regional political landscape. Greca's pre-candidacy will be officially presented in an event next week in Brasília, signifying his serious intent to compete in the upcoming elections.

This move is part of a larger political shift in Brazil as key figures are repositioning themselves ahead of the elections, highlighting the ongoing dynamics within regional political parties. Greca's association with MDB might strengthen his political influence in Paraná, especially if aligned with the popular governor Ratinho Junior, likely impacting the electoral landscape as various candidates vie for public support in what is expected to be a competitive race for the governorship.