The 65-year-old Portuguese was appointed as Flamengo manager in June last year and led the team to the Brazilian league title as well as the Copa Libertadores. He has also added the Super Cup of Brazil, Recopa Sul-Americana and the Carioca State Championship to his laurels during his short time in Brazil.
Jesus signed a one-year contract extension with the South American champions just last month to remain at the club until the summer of 2021 but has now agreed to rejoin his old club who have been dethroned as champions of Portugal by FC Porto.
"Despite regretting the loss of their victorious coach, Flamengo respects this personal decision," Flamengo said in a statement.
"On behalf of the entire board and the 42 million red-blacks who make up the biggest fan club in the world, our greatest thanks to him and all his technical committee for everything that has been done and our wish that they continue to maintain the enormous success as had with us.
"Flamengo, following what its anthem advocates - and which Jorge Jesus represented so well - will continue in its usual goal: Win, win, win!"
Jesus wrote via Instagram: "It was 13 months of perfect union, a time when I was very happy, I felt at home, we had unforgettable achievements. But today we met with the Flamengo board and decided that it was time to end our relationship, without hurting, resentment.
"A break that will leave no scars, only memories of victories and titles, emotions that I will carry for life. End of a cycle, the time has come to return to Portugal. Flamengo, I am sure, will follow its victorious trajectory because it has a cast and structure that matches its greatness.
"To the club, its board and its employees, to this fantastic group of players, to the fans of Flamengo, my eternal gratitude, you will remain forever in my heart."
Jesus’ first spell at the Estadio da Luz brought three Portuguese League titles between 2009 and 2015.
Jesus tested positive for the coronavirus disease back in March but he has since made a full recovery.
