[7] By June 2019 Manyisa was reportedly close to signing for a top Malaysia Super League club with only a few details still being finalized.
[8] Ultimately for the 2019/20 season, he moved to Manzini Wanderers of the Eswatini Premier League on a season-long loan from Vovovo after a permanent deal could not be reached with Real Madrid or the Malaysian club.
[12] Manyisa was ruled ineligible to play by the Eswatini Football Association for a time until multiple official paperwork issues related to the transfers were sorted.
[3] In March 2018 he was part of Eswatini's under-20 squad for a home-and-away series against Malawi in the first round of 2019 Africa U-20 Cup of Nations qualification.
[20] In November 2019 Manyisa was set to be part of the Eswatini squad for two 2019 Africa U-23 Cup of Nations qualification matches against Mozambique but had to withdraw to attend his trial with Real Madrid.
[21] Manyisa received his first call-up to the senior national team in September 2019 for Eswatini's second-leg 2022 FIFA World Cup qualifier at home against Djibouti.
[25] He made his senior international debut on 6 July in the team's opening match of the latter tournament, coming on as a second-half substitute in a 3–0 victory over Mauritius.