Chicago Bears wide receiver Keenan Allen is familiarizing himself with Caleb Williams very early.

Williams, who is expected to be selected by the Bears with the No. 1 overall pick in the 2024 draft after Chicago traded Justin Fields to the Pittsburgh Steelers, took the field on Wednesday at USC's pro day.

Allen was among those in attendance to get a look at his potential future quarterback:

Speaking to reporters this week, Allen said he was impressed with what he saw from Williams during his career at USC.

"Hell of an athlete," Allen said. "Obviously, he can make tremendous plays with his feet, with his arm. Looks like he knows the game really well. Really good."

The Bears acquired Allen from the Los Angeles Chargers last week for a fourth-round pick. Allen's addition gives Chicago another bona fide star at wide receiver alongside DJ Moore.

The 31-year-old, who spent the first 11 seasons of his career with the Chargers, is a six-time Pro Bowler. He has recorded six 1,000-plus-yard seasons and five seasons with at least 100 receptions.

While Allen is past his prime, he's still coming off a 2023 campaign in which he caught 108 passes for 1,243 yards and seven touchdowns in 13 games.

The veteran said this week that he believes his presence in Chicago will help a rookie quarterback such as Williams get acclimated to life in the NFL.

"I know the game. I know the ins and outs, I know the zones, I know how to beat man, I know pretty much how to play the game," Allen said. "I just think I'm friendly for the quarterback because I'll be in the right spots. I know how to communicate with him, and my body language is solid, too."

Williams, the 2022 Heisman Trophy winner, is ranked as the second-best quarterback available in the 2024 draft class on the Bleacher Report NFL Scouting Department's post-combine big board behind UNC's Drake Maye.

B/R NFL Scout Derrik Klassen wrote of Williams:

"Overall, Williams is a fascinating prospect. The arm talent oozes off the film, and he is a special playmaker when things break down. Williams is also more put together as a processor than his playing style suggests, even if he still needs work.

"In the NFL, Williams would fit best in a spread-out passing offense that gives him space and enables his playmaking ability, similar to Arizona Cardinals quarterback Kyler Murray or the aforementioned Josh Allen."

The first round of the 2024 NFL draft is set for April 25 in Detroit.