Melbourne City's fans are in open revolt over Bruno Fornaroli's sidelining, threatening no-shows and protests at Sunday's match with Newcastle Jets.

Fan favourite Fornaroli was surprisingly missing from City's team sheet for last week's loss to Brisbane, and has been kept out of the squad once more for the round six date.

Bruno Fornaroli has again been left out by Melbourne City. Credit:AAP

Coach Warren Joyce has cited the need to uphold player-set training standards for the omission, with reports the Uruguayan failed a skinfold test.

It hasn't washed with City's fanbase, which has called for Joyce to leave or be sacked.