O'Neill, a tight end and defensive end in high school, was a tight end during his redshirt season in 2014. He moved to offensive tackle before the 2015 season, started 12 games, and continued to start in 2016. O'Neill took over as the starting left tackle in 2017 due to injuries along the offensive line and went on to earn All-ACC honors.
Matt Maiocco mentioned O'Neill's athleticism. The offensive lineman carried the football twice in 2016 and scored a rushing touchdown each time.
At the NFL Scouting Combine, the 6-foot-7 and 305-pound O'Neill had a 40-time of 4.82 seconds, a vertical jump of 29.5 inches, a broad jump of 107 inches, completed the three-cone drill in 7.14 seconds, had 22 reps in the bench press, and a 20-yard shuttle time of 4.5 seconds. Other measurables for O'Neill include an arm length of 34 1/8 inches and hands that measure 9 3/8 inches.
NFL.com projects O'Neill to be a second- or third-round draft pick.
Lance Zierlein of NFL.com, who compares O'Neill to Jake Fisher, wrote the following within his scouting report:
"O'Neill has good length and is a terrific athlete, but his inconsistencies at the Senior Bowl practices will be hard for teams to get out of their minds. What might be even more troubling is the way he seemed to panic and lose technique in certain matchups. O'Neill is a classic zone scheme blocker, but teams may take a look at him as a move guard with tackle potential rather than locking in with him as a blind-side tackle. O'Neill needs to get thicker and stronger or swing tackle could be his ceiling."
Measurables
Height: 6-7
Weight: 305 lbs.
Arm length: 34 1/8 inches
Hand length: 9 3/8 inches
NFL Scouting Combine
40-time: 4.82 seconds
Vertical: 29.5 inches
Broad jump: 107 inches
3-cone drill: 7.14 seconds
Bench press: 22 reps
20-yard shuttle: 4.5 seconds
More San Francisco 49ers News
-
49ers overlook size concerns, add skilled receiver in The Athletic's 2026 NFL mock draft
The San Francisco 49ers could be in the market for a first-round wide receiver when the 2026 NFL Draft arrives. Brandon Aiyuk's future remains uncertain, and many around the league believe the veteran wideout has likely played his final snap for the 49ers—even after signing a... -
2026 mock draft: 49ers target 6-4 receiver with 'massive catch radius'
With speculation growing that the relationship between the San Francisco 49ers and wide receiver Brandon Aiyuk may be nearing its end, early 2026 mock drafts are beginning to focus on potential replacements for the former first-round pick. Aiyuk is still recovering from the... -
2026 NFL mock draft: 49ers target Brandon Aiyuk replacement with first-round pick
The San Francisco 49ers appear poised to part ways with veteran wide receiver Brandon Aiyuk. Aiyuk continues to rehab from the ACL and MCL injuries he sustained in October 2024. The team reportedly grew frustrated with Aiyuk for missing offseason rehab appointments and... -
49ers' Fred Warner pushing for playoff return despite ankle injury timeline
The San Francisco 49ers aren't counting on having linebacker Fred Warner back for the postseason if the team makes a deep playoff run. Still, the All-Pro defender is attacking his rehab from the dislocated and fractured right ankle he suffered on October 12 with every intention...