Ramagalela, the PSL's top scorer with six strikes this season, was also awarded the Goal of the Month award for August/September.
His winning goal, as voted for by fans, came when he completed a match-winning brace against his former employers Mamelodi Sundowns at Loftus Versfeld Stadium on August 22.
Ramagalela flicked the ball over his marker before turning and lifting it over Downs goalkeeper Denis Onyango and into the back of the net.
Jelusic, who is in his first season in South Africa, steered Celtic to three league wins and one defeat last month, as they currently sit fourth in the standings.
The Serbian's charges beat Bidvest Wits, Cape Town City and Maritzburg United, while they came unstuck against Ajax Cape Town in the Mother City.