The 24-year-old Collins, however, would prefer to remain on the outside.
"I like playing tackle," Collins said Sunday, via the team's official website. "Right now, I'm focused on playing tackle. That's where my mindset is. That's where I'm grinding for."
Dallas is considering moving Collins back inside, if Fleming can win the outside gig, to help re-solidify a line that overall had a down year last season.
"I played against a lot of great players at right tackle. It made me better as a player," Collins said. "Pretty much being able to play every position except center feels great. It was a big stepping stone for me going into next year. I'll be ready wherever it is.
"[But] I don't even thinking about switching positions. I'm just focused on getting bigger, faster, stronger and making sure I'm healthy going into this year. I'll be ready to roll."
Head coach Jason Garrett insisted the goal is to get the five best offensive linemen on the field in 2018. Collins' future earning potential gives him an incentive to want to remain at tackle. Whether he's moved back inside will likely depend on whether Fleming or newly signed guard Marcus Martin earns his way into the top 5 rotation.