UFC star Urijah Faber's comeback could be a short one -- like 1 fight -- IF he doesn't get a crack at champ-champ Henry Cejudo, the HOFer tells TMZ Sports.
40-year-old Faber walked away from fighting in December 2016 ... but recently inked a deal to fight Ricky Simon at UFC Fight Night 155 on Saturday -- almost 3 years after retiring.
The California Kid tells us he hasn't decided what he'll do after his fight -- meaning he could hang the gloves back up.