Arizona Fall League Preview: Toronto Blue Jays
By Hannah Wells ·
All eight Toronto Blue Jays AFL representatives join the Mesa Solar Sox. The group skews toward pitchers with questions about command, health, or both, plus a pair of outfielders with tools that still need translating and a catcher who hit for power at Double-A. There is no headliner here, but a strong fall could change how the organization views a few of these players heading into the winter.
Brandon Barriera Needs Healthy Innings
Brandon Barriera's 2026 season reads about how you'd expect from a 22-year-old left-hander whose professional career has been interrupted more than it has moved forward. He finished with a 4.89 ERA across 38.2 innings, walked 29 batters, and posted a 1.71 WHIP. He threw only about 55 percent of his pitches for strikes, averaged nearly 19 pitches per inning, and never went more than four innings in an outing. The walks and the short, uneven starts have kept him from building momentum.
The talent is there. His 80Grade report has the fastball at 92 to 98 mph and grades the slider as plus, with the athleticism to create deception, and it projects him as a mid-rotation starter if he stays healthy. The problem is that his lower-half timing and release point have not caught up to the arm. When the delivery clicks, the fastball-slider pairing is hard to hit. When it doesn't, the walks pile up and outings end early.
Barriera has had almost no chance to simply pitch. A hybrid Tommy John and internal brace procedure in April 2024, a fractured ulna in August 2025, and an injured list stint from mid-May to late July this year have left the 2022 first-round pick with a professional resume far thinner than his draft profile suggested. The AFL is about stringing together healthy innings and getting his delivery to repeat at something close to a normal workload. 80Grade ranks him No. 28 in the Blue Jays system.
Jake Bloss and a Return From the 60-Day List
Jake Bloss came to Toronto as the headline piece of the Yusei Kikuchi trade in July 2024. He is 25 now, had UCL surgery in May 2025, and strained his right teres major in July of this year, and his 2026 numbers across four levels show how uneven the comeback has been. At Triple-A Buffalo, he posted an 8.69 ERA over 19.2 innings with six home runs allowed and an 11.1 percent strikeout rate. His rehab outings in the complex and at Single-A Dunedin went much better: 21 strikeouts and two walks in 16 innings, suggesting the stuff is there when his mechanics are right.
The arsenal is diverse. His 80Grade report has a four-seamer at 93 to 98 mph, plus a slider, sweeper, and curveball that each grade at 55, with the changeup as the weak link. It also grades his makeup well, which helps for a pitcher resetting after two straight injury-shortened seasons. The Blue Jays put him on the 60-day injured list in August, and reports at the time said he wasn't expected to pitch again in 2026, so his innings in Mesa are a bonus if they happen. If he can pitch regularly and show the Buffalo struggles were circumstantial rather than structural, Toronto has more to work with. If the gap between stuff and results persists, the back-of-the-rotation ceiling gets harder to defend.
Aaron Parker's Power Behind the Plate
Aaron Parker, a 23-year-old catcher, hit 19 home runs in 87 games at Double-A New Hampshire. For a player whose 80Grade report projects him as a reserve, that number deserves attention. The .253/.347/.467 line comes with contact concerns: 113 strikeouts in 350 plate appearances, a 32.3 percent strikeout rate. His 12.3 percent walk rate softens that somewhat.
The report grades his defense as fringe-average, with arm strength below the positional standard, and his 12 steals in 87 games are a surprise for a catcher. The AFL will test whether the swing-and-miss is manageable against better pitching or whether it becomes the factor that limits his ceiling. At 23, he needs the at-bats in Mesa to show that the power plays in games against advanced arms.
Jake Cook Brings Contact and Speed
Jake Cook's calling card is well established: he is athletic, he makes contact, and he runs. The 2025 third-round pick out of Southern Miss hit .250/.367/.371 in 72 games at Single-A Dunedin after opening the year in the complex, with a 14.3 percent walk rate, 21 steals, and a 28.4 percent strikeout rate that is high for a contact-first hitter.
His 80Grade report reads as a high-floor, lower-ceiling profile: an above-average hit tool, above-average speed, enough range to be an above-average corner defender and possibly handle center field, and not much home run threat. Five home runs with a mostly flat swing path point to fringe-average power at best, likely in the 8-to-12-homer range at maturity if he adds strength. The AFL reps are about getting him more aggressive in hitter's counts and seeing whether he can produce harder contact without giving up the zone discipline that makes him useful. 80Grade ranks him No. 13 in the Blue Jays system.
Jake Casey Making Up Lost At-Bats
Jake Casey spent April 4 to June 23 on the injured list, worked through rehab assignments in the complex and at Dunedin, and then showed pop at High-A Vancouver: a .244/.373/.502 line with 12 home runs in 57 games. The 27.8 percent strikeout rate shows there is swing-and-miss in his game, and the gap between his athleticism (80Grade grades both his speed and arm as plus) and his hit tool is the central question in his profile. 80Grade ranks him No. 21 in the system.
For Casey, the AFL is about replacing the at-bats he lost in the first half. His profile as a right fielder with speed and arm works if the hit tool develops, and the High-A power from a 2025 15th-round pick is encouraging. The fall is a chance to face better pitching and see whether his approach sharpens against more consistent breaking-ball sequencing.
The Pitching Group: Perez, Rojas and Batista
Fernando Perez's AFL assignment arrives after a difficult 2026. Command and pitchability had been his main selling points, but he spent May 4 to August 30 on the development list, and in 20 Double-A innings he posted a 7.20 ERA with 25 walks, throwing only about 51 percent of his pitches for strikes. That is a sharp departure from the pitcher who had a 3.00 ERA in six Double-A starts late in 2025. His 80Grade report has a low-to-mid-90s fastball with a usable slider and changeup, and he projects as a back-end starter if the command returns. The AFL gives him a reset and a chance to show whether 2026 was a blip or a trend.
Yondrei Rojas is a reliever with a legitimate weapon: an 89 mph cutter that 80Grade grades as plus. He spent most of 2026 at Double-A after missing April with an injury, posting a 5.53 ERA across 42.1 innings with a 9.1 percent walk rate and a 20.3 percent strikeout rate, then got a brief Triple-A look in September. The home runs (five in 42.1 innings at Double-A) are a bigger concern than the control. This is his second AFL stint after he allowed eight earned runs in 2.1 innings for Glendale last fall, so the reps will test whether the cutter holds up once advanced hitters have seen it a few times.
Gilberto Batista, 21, had a difficult full season at High-A Vancouver: a 7.86 ERA across 87 innings in a mixed starter and reliever role, with 19 home runs allowed and an 11.0 percent walk rate. He is young for a High-A regular, and the AFL gives him a chance to work through what went wrong, but the 2026 line points to a pitcher still searching for a reliable approach against advanced hitters.
Bottom Line: Barriera Has the Most at Stake
Barriera is the player whose fall carries the most weight for this organization. He is the only one in this group with a mid-rotation ceiling, and he has barely pitched as a professional. If he logs regular innings, repeats his delivery, and keeps the slider missing bats while cutting into the walks, Toronto gets useful information on whether the pre-draft projection is still in play. Everything else in this group ranges from supplementary development to roster positioning, and Barriera's health in Mesa is the one variable that could shape how the organization allocates a 40-man spot this winter.