Former Leeton coach Marika Vunibaka will miss the next three weeks after being suspended by the Southern Inland judiciary.
Vunibaka was red carded in the loss to Ag College before the general bye for dissent.
He was found guilty of the charge.
Vunibaka will miss clashes with CSU, Griffith and Albury as the Phantoms look to reinvigorate their season.
Leeton are currently seventh on the ladder, seven points behind fourth-placed Tumut.
The next month will be crucial for the club taking on teams also outside the finals placings.
They won just the two games so far, with their last win coming against the Steamers in round three.