[4] Sixteen days later he made his debut in the first round of the Taça da Liga in a 1–0 home loss to Real SC,[5] though the result was revoked in his team's favour as the opponents had fielded the suspended Abou Touré.

[7] In Muriel's second season in Belém, with the team now spun off as Belenenses SAD, he was an ever-present for the first 32 league matches, including a 2–0 home win over eventual champions S.L.

[8] In his final game for the club on 5 May 2019, he gifted city rivals Sporting CP the opening goal by giving the ball to Raphinha, he then fouled the same played in the 21st minute and was sent off in an 8–1 loss.

[12] In his debut Campeonato Carioca season, Becker reached the final with Fluminense, losing 3–1 on aggregate to rivals Flamengo in July 2020.

[14] Muriel's younger brother, Alisson Becker, is also a professional footballer and a goalkeeper for Premier League club Liverpool and the Brazil national team.