Davison, meanwhile, returns to the team he drove for on a full-time basis between 2006 and 2008.
Now a two-time Bathurst winner, Davison is one of the most experience drivers on the grid, and feels he has a lot more left in the tank.
While aware of the challenge to keep DJR at the front, Davison believes he can make 2021 his year to finally break through to hit the very top.
"There's such a sound structure in place at that team, engineering-wise. The whole organisation is so strong in depth, so much so that I don't need to lead them that much," the 38-year-old told Supercars.com.
"I'll try and help Anton in any way I can, I'm more than happy to.
"There are a lot of elements away from the track and out of the car that play a role.
"It's a bigger team environment, you're challenging for championships.
"I can drive my absolute best, I feel like I've got my best driving ahead of me.
"It's a great opportunity for me, so I'm chomping at the bit to get that elusive championship."
Davison and De Pasquale will turn laps at the official pre-season test at Queensland Raceway on Friday.