Rosen, who was the 10th overall pick of the 2018 NFL Draft, told reporters recently that Bradford has been "helping me out a ton" and that he'll return the favor in any way he can during his rookie season.
"I think it speaks to him as a person and how he's willing to embrace the competition and the team aspect," the 21-year-old Rosen said, via the Arizona Republic. "And I'm the same way. Regardless of starter-backup, I want the Arizona Cardinals to do the best possible because I want to be in a Super Bowl. If at least for this year the best way to do that is have Sam starting, then so be it, and I'm going to push him every single day."
Bradford signed a one-year, $20 million contract with the Cardinals in March. One month later, Arizona moved up five spots to select the UCLA quarterback in the first round of the draft.
The 30-year-old Bradford also reached out to Chad Kanoff, the Cardinals' undrafted rookie free agent out of Princeton.
"I'm an open book, ask me anything. I'll give you everything I've got," Bradford said he told both of them, per the Arizona Republic. "I've gone through quite a bit in my career just as far as different offenses. I've seen a lot of different offenses so I feel like I'm fairly knowledgeable in some of the schemes and some of the schemes that we're doing.
"I'm more than happy to help and just try to show them the way that I work, the way that I prepare, and hopefully they take something from that."
Bradford has a lengthy injury history, appearing in only two games with the Minnesota Vikings in 2017. He has played 80 of a possible 112 regular-season games. If he can stay on the field, the former Heisman Trophy winner and No. 1 overall pick in 2010 is expected to be under center in Week 1.
While the Cardinals continue to manage Bradford's workload, Rosen has received plenty of repetitions during offseason workouts and has earned praise from Cardinals head coach Steve Wilks.
Rosen passed for 3,754 yards and 26 touchdowns with 10 interceptions in 2017 with the Bruins. He posted career numbers of 9,301 yards passing with 59 touchdowns and 26 interceptions in 30 games.