Trubisky has been written off in the minds of many, and the Bears acquired Foles back in March in case they too decide to count him out down the line.
"It's very motivating," Trubisky said Friday. "You're always going to have people writing you off. It just has to light a fire under you, which it has for me."
The Bears' quarterback competition hasn't yet begun in earnest at Halas Hall, where the opening days of training camp have been devoted to coronavirus testing and acclimation to the new normal amid the pandemic. But for Trubisky, the motivation level is already high.
Soon, Trubisky will break the Bears' huddle for the first time in 2020 and begin to fight for his future.
"For people who write you off, it definitely motivates you in a way where you want to go out and play as best as you can," Trubisky said. "I'm definitely fired up."
The Bears' reasoning for creating a quarterback competition was two-fold. Beyond desiring an alternative in the case of Trubisky faltering, they believed he would respond well to having a true competitor like Foles pushing him for the starting job.
Foles is approaching this from a more familiar perspective, because he has made a career out of mostly serving as a backup. He has been in these types of battles before and is greeting the challenge as if he has nothing to lose.
"Whatever the coaches say, that's what's best for the team, and then we roll as the Chicago Bears."
Foles never truly considered opting out of playing in 2020, he said, feeling confident in the Bears' health protocols. He also isn't viewing himself at a disadvantage despite the limited time on the field that he has to knock the incumbent starter Trubisky out of his top spot. All preseason games have been canceled, and full-contact practices don't start until Aug. 17. Chicago plays its opener at Detroit on Sept. 13.
With the offseason program having been conducted virtually, Trubisky and Foles have yet to take competing reps in practice. They will soon enough, and the Bears' quarterback competition will truly begin.
"Every day I show up, I have to prove to myself that I'm the No. 1 guy for this team," Trubisky said. "And that's just showing up every day and being prepared and going out and being the best quarterback I can be for this team. That's my mindset.
"You've just got to take advantage of practice every single day and show the guys that I'm the leader that this team needs and just roll with it going forward."