Brown will partner Reynolds later this year in the Pirtek Enduro Cup, but will make his Supercars ‘debut' this week in the iRacing competition.
Speedcafe.com understands Reynolds will return for the third round.
“Making my main game debut Wednesday night… well on Eseries,” Brown wrote on social media.
“Can't wait to have a crack at this, I am like a zombie since practicing eight hours a day all weekend.”
Brown is a credentialed touring car competitor having won the inaugural TCR Australia Series in 2019 with HMO Customer Racing.
The 21-year-old has recently contested the ARG eSport Cup, a TCR-based competition with Australian Racing Group affiliated drivers.
Round 2 of the BP Supercars All Stars Eseries gets underway on April 15 at 18:00 AEST on Foxtel.