Central Coast will appeal the length of striker Roy O'Donovan's eight week suspension for headbutting Wellington's Manny Muscat.

O'Donovan received the second longest ban in the A-League's history from the FFA's disciplinary committee on Wednesday night.

The Mariners believe that the penalty is too harsh, particularly compared with the two week ban Manny Muscat received for his part in the clash.

“We are extremely disappointed at this decision, the disparity in sanctions issued for this match, which highlights the flaws in the system," Mariners CEO Shaun Mielekamp said after the hearing.

"The media circus around the incident has had a high impact on the result and we will look at our avenues for appeal."