Tigers to select John Peck, infield prospect, from Triple-A Toledo

What happened

The Detroit Tigers are set to select the contract of infield prospect John Peck from Triple-A Toledo, per Baseball America's Emily Waldon. The move is not yet complete — Detroit will need to clear space on both the 26-man and 40-man rosters before Peck can formally join the major-league club.

Peck, a seventh-round pick out of Pepperdine in the 2023 draft, is described by Waldon as a quality defensive shortstop with the versatility to handle second and third base as well.

Why it matters

The Tigers are reportedly calling up a prospect who has done nothing quietly in his first exposure to Triple-A. Per Baseball America, Peck has hit .500 with a home run across 19 plate appearances in five games at that level — a sample small enough to fit in a carry-on bag, but the kind of number that tends to accelerate a front office's timeline.

The broader picture is a 2026 season that has taken Peck through four levels of the minor-league system, including a pair of injury rehab stints at Class-A and High-A. He spent the bulk of the year in Double-A before the recent promotion to Toledo. Waldon frames the Triple-A stint as brief but emphatic.

Roster mechanics add a layer of procedural interest here. To select Peck's contract, Detroit must create room on both the 26-man active roster and the 40-man roster — the reserve list a player must appear on before any call-up can be processed. That means at least two transactions are pending before Peck takes the field in a Tigers uniform. The timing is also notable: under general league rules, active rosters expand from 26 to 28 players beginning September 1, which gives clubs additional flexibility in the final weeks of the regular season. Detroit is making this move right at that threshold.

The numbers

The season line Waldon cites covers 69 games and 293 plate appearances across all levels in 2026. Peck has slashed .286/.336/.504 with 11 home runs, 19 doubles, and three triples. He has stolen 22 bases in 28 attempts. His walk rate sits at 6.5% and his strikeout rate at 24.9%.

The .504 slugging figure is the one that earns the call-up conversation. Combined with 22 steals, it sketches a profile that is more complete than a pure pop-or-speed binary — Peck is apparently doing both, at a pace that moved him from Double-A to Triple-A and now, reportedly, to Detroit.

MLB.com's prospect rankings place Peck 20th among Tigers prospects — a ranking that reflects organizational depth as much as any ceiling question. A 20th-ranked prospect getting a September look is not unusual for a club in Detroit's position; it is, in fact, exactly what September is for.

Where the club stands

Detroit enters this week at 65-77 (.458), sitting fourth in the AL Central, 9 games back of the division lead. In the Wild Card picture, the Tigers rank 9th, 6.5 games relative to the cut line. They are riding a one-game winning streak.

The schedule ahead is a three-game road series at Minnesota's Target Field. On Monday, August 31, Jackson Jobe is the probable starter for Detroit against Taj Bradley for the Twins. Tuesday, September 1 lines up Troy Melton against Andrew Morris. Wednesday, September 2 has Drew Anderson going against Dean Kremer.

A club 6.5 games outside the Wild Card cut line in the final month of the season is not in the business of protecting a roster spot for a prospect's development arc — it is in the business of finding out what it has. Peck's reported call-up fits that logic cleanly. The Tigers are not contending for October; they are auditing for next year, and a 24-year-old who has hit at every level he has visited in 2026 is exactly the kind of audition worth scheduling.

What we don't know yet

The two roster moves required to complete this transaction have not been reported. It is not yet known which players will be displaced on the 26-man or 40-man rosters to create room for Peck. Until those moves are announced, the call-up remains a report rather than a completed transaction.

It is also worth noting that Peck's Triple-A numbers — the .500 average, the home run, the 19 plate appearances — represent a five-game window. Waldon presents them as context for the call-up decision, not as a settled evaluation of his Triple-A ability. The full-season line across 293 plate appearances carries more weight as a sample, and that line is the one that appears to have driven the decision.

What to watch

### Will Peck be available for the Minnesota series?

That depends on when Detroit completes the required roster transactions. Per Baseball America, both a 26-man and a 40-man move are still needed. Once those are processed and the contract is formally selected, Peck would be eligible to appear. The Tigers open at Target Field on Monday, August 31 — so the window is tight but plausible if the paperwork moves quickly.

Beyond the immediate series, the question is where Peck fits in Detroit's infield picture. Waldon notes he can play shortstop, second base, and third base, which gives the Tigers options in how they deploy him. A versatile infielder arriving in September, with roster rules allowing expanded active rosters, is a useful piece regardless of where the club stands in the standings.

The other thread to follow is the 40-man roster move itself. Adding a player to the 40-man is a meaningful organizational signal — it is the list that determines Rule 5 draft eligibility and exposure. Detroit is not just giving Peck a September cup of coffee; reportedly, they are formally protecting him within the roster structure. That is a quieter but more durable commitment than the call-up headline alone suggests.

Peck's path through four levels in a single season, including rehab stints, is the kind of résumé that tends to get summarized as "development year" and filed away. The Tigers, reportedly, have decided it looks more like a scouting report than a footnote.