Quentin Johnston

Popper made it a point to say that these reps can provide us with "some insight into the rotations." Former first-round pick Quentin Johnston worked with the second-team offense during this portion of practice. Johnston imploded as a rookie and amassed just 431 yards on 38 grabs. Chark hasn't done much lately either, but has plenty of NFL experience and can fill the vacant X receiver role in LA. Johnston's role is alarmingly shaky heading into his second season. Chark, on the other hand, is a viable final pick in deep drafts.

Thursday's starter vs. starter drills at Chargers camp found second-round WR Quentin Johnston working with the second team, according to The Athletic's Daniel Popper. The first-team trio: Ladd McConkey, D.J. Chark, and Joshua Palmer.

Training camp takeaways: Quentin Johnston, Justin Herbert and secondary impress new coach Jim Harbaugh on first day of summer practices.

This isn't great for Quentin Johnston, who is hoping to put a disappointing rookie campaign behind him this season. The former No. 21 overall pick out of TCU totaled 38 receptions for 431 yards and two touchdowns in 17 games last season, which included 10 starts. Despite the ample play time, Johnston was repeatedly passed by in the target pecking order. Johnston eclipsed 50 receiving yards in just three games last season and was targeted on just 13.3 percent of his routes -- a dreadfully low mark. Popper reports McConkey has played primarily in the slot this spring, with Chark fitting in as "a true X." We have a long way to go until the start of the season, but it sounds like Johnston will be battling out of the gate to earn significant reps.

Kyle Dvorchak breaks down the fantasy outlooks of Justin Herbert, Quentin Johnston, Ladd McConkey, and the rest of the Los Angeles Chargers.