The two preliminary finals have been locked in, with the AFL confirming Richmond's MCG prelim will be played at 4:45pm.
The AFL had previously left the time slot up in the air, but confirmed the time slot on Saturday night.
It means another Saturday twilight prelim for the Giants next week, who progressed with their 67-point win over the Eagles.
The other preliminary final between Adelaide and Geelong will take place on Friday night.
Finals week three:
Friday September 22
Adelaide vs. Geelong, Adelaide Oval, 7:50pm AEST/7:20pm ACST
Saturday September 23
Richmond vs. GWS, MCG, 4:45pm AEST