Gerri Martin Milliam Mandagi (born 12 June 1983) is an Indonesian professional footballer who plays as a goalkeeper.
Gerri Mandagi was signed for Mitra Kukar to play in Indonesia Soccer Championship A in 2016. He quickly rose as the team's starting goalkeeper, appearing in 40 matches in four seasons.
Mandagi in 2020 signed for Persipura Jayapura to play in Liga 1 in the 2020 season. This season was suspended on 27 March 2020 due to the COVID-19 pandemic. The season was abandoned and was declared void on 20 January 2021. Mandagi made his league debut on 28 August 2021 in a match against Persita Tangerang at the Pakansari Stadium, Cibinong.
PSBS Biak