Diamondbacks designate Zack Littell for assignment

The Diamondbacks designated right-hander Zack Littell for assignment, the club announced, clearing a spot on the 40-man roster for Drey Jameson's activation from the 15-day injured list. Jameson had been sidelined since late July with right hip inflammation, per the announcement.

The move leaves Arizona's 40-man roster at 39 players.

What happened

Littell was removed from the 40-man roster in the corresponding transaction when Jameson was reinstated, the club announced. The designation gives Arizona seven days to trade Littell, release him, or place him on outright waivers.

Jameson returns after missing nearly a month with the hip issue that landed him on the injured list in late July.

Why it matters

The designation opens a roster pathway question for a club chasing October. Arizona now has a week to resolve Littell's status — whether through a trade, an outright assignment if he clears waivers, or his release — while managing a rotation and bullpen workload down the stretch.

The Diamondbacks are two games into a winning streak and face a Sunday afternoon game against Cincinnati before opening a two-game set with the Cubs. The rotation lines up Mitch Bratt on Sunday, Merrill Kelly on Monday, and Brandon Pfaadt on Tuesday. Jameson's return adds depth to a pitching staff navigating the final six weeks of the regular season.

The 40-man roster sitting at 39 gives Arizona flexibility for another move without forcing a corresponding transaction, though that calculus shifts daily as clubs manage injured list returns, September call-up planning, and the roster expansion that arrives in a week.

Littell's designation for assignment starts a seven-day clock. Within that window, the Diamondbacks can trade him to another club, place him on outright waivers, or release him. If he is placed on waivers and clears, Arizona can outright him to the minors or grant his release. If another club claims him on waivers, he moves to that organization's 40-man roster.

The mechanics favor speed. Outright waivers run 48 hours, giving all other clubs a chance to claim a player at his current contract. A claim awards the player to the team with the worst record among those that submitted a claim. If Littell clears, Arizona controls his next assignment.

The timing also matters for Jameson. A pitcher returning from the injured list often needs a ramp-up period, either through a rehab assignment before activation or shorter outings upon return. The club did not specify Jameson's immediate role — whether he slots back into the rotation, works in long relief, or builds up through limited innings.

Where the club stands

Arizona enters Sunday with a 76-68 record, second in the NL West and 10 games behind the division leader. The Diamondbacks have won two straight and host the Reds this afternoon at Chase Field before the Cubs arrive for a two-game series starting Monday.

The rotation schedule has Bratt facing Cincinnati's Andrew Abbott on Sunday, Kelly opposing Kevin Gausman on Monday, and Pfaadt matched against Clay Holmes on Tuesday. The three-game stretch offers a look at how the Diamondbacks will deploy Jameson upon his return and whether the bullpen workload shifts with another arm available.

Arizona sits in the thick of the National League playoff picture with three weeks remaining in August and all of September ahead. The 76-68 mark puts the club in position to contend for a wild-card berth, though the division title remains a longer climb with 10 games separating them from first place.

The two-game winning streak provides momentum heading into a homestand that will test the rotation depth Jameson's return is meant to bolster. The Reds and Cubs series will clarify how Arizona plans to manage its pitching staff as the calendar turns toward September and roster expansion.

What we don't know yet

The club has not announced whether Littell will be traded, placed on outright waivers, or released. Arizona has seven days from the designation to resolve his roster status.

Jameson's role upon activation — whether he slots into the rotation, works in long relief, or builds up through shorter outings — was not specified in the announcement. His first appearance back will signal the Diamondbacks' plan for integrating him into the pitching staff.

The 40-man roster now sits at 39, one spot below the limit. Whether Arizona uses that open slot for another move before the September roster expansion, or holds it in reserve for injury or performance needs, remains to be seen.

What to watch

Littell's next destination will clarify within the week. If he clears outright waivers, Arizona can assign him to the minors or release him. If another club claims him, he moves to that organization's 40-man roster. The seven-day window runs through the weekend and into next week.

Jameson's first appearance back will signal how the Diamondbacks plan to deploy him. The rotation is set through Tuesday, but the schedule beyond that — and the bullpen's workload management — will shape whether Jameson returns as a starter or in a multi-inning relief role. His performance and pitch count in that first outing will offer clues about his readiness for a full starter's workload.

Arizona's 40-man roster sitting one spot below the limit also bears watching. The club can add a player without forcing another designation, a useful margin as September roster expansion approaches and clubs finalize their postseason depth charts. The Diamondbacks have until September 1 to operate under the 26-man active roster limit before expanding to 28 players for the season's final month.

The homestand against Cincinnati and Chicago will test the rotation depth Jameson's return is meant to provide. How the Diamondbacks manage innings and workload across the next week will shape the pitching staff's readiness for the playoff push ahead.