Ghana defender David Addy scored to end Panaitolikos' four-match winless run with a 1-0 win at Xanthi Skoda in the Greece Super League.
The left-back made a run to head home a cross on 40 minutes on Saturday night.
Addy was withdrawn after 65 minutes due to injury and his position was taken by Moumin.
The 21-year-old is on loan from Portuguese side FC Porto.