Giants select Braxton Roxby, place Adrian Houser on IL with forearm strain

The Giants announced Monday that they have selected right-hander Braxton Roxby from Triple-A, filling the active roster spot vacated by Adrian Houser, who was placed on the 15-day injured list with a right forearm strain. The club also transferred left-hander Carson Whisenhunt to the 60-day IL.

Houser started Sunday's game but left in the second inning. The club announced the forearm strain diagnosis Monday. He will miss at least a couple of weeks, per MLB Trade Rumors.

Whisenhunt received a diagnosis of a sprained ligament in his elbow this week. MLB Trade Rumors reported earlier Monday that he will undergo surgery, though it is not yet clear whether that will be full Tommy John surgery or an alternative procedure. He will miss the remainder of the season regardless, and his transfer to the 60-day IL opens a spot on the 40-man roster.

What happened

Roxby's selection gives the Giants a fresh arm for a rotation that has been thinned by injury and trade-deadline departures. The club dealt Tyler Mahle and Robbie Ray ahead of the deadline, and the rotation has absorbed multiple injuries since. Houser's forearm strain is the latest blow, coming one day after he took the mound for Sunday's start.

The 15-day IL placement for Houser is retroactive to the date of his injury, meaning he will be eligible to return in mid-September at the earliest. The forearm strain diagnosis carries the usual uncertainty about timetable until the club provides further updates on imaging or treatment.

Whisenhunt's transfer to the 60-day IL was procedural once the surgery decision was made. He had been on the injured list since the ligament diagnosis earlier this week, and the move to the 60-day designation formalizes his absence through the end of the season while clearing roster space for Roxby.

Why it matters

The Giants are operating with a patchwork rotation in the final weeks of a season that has long since slipped away. At 59-84, they sit 26.5 games back in the NL West and 16.0 games out of the Wild Card cut line, eliminated from the division race. The club's focus has shifted to evaluating younger arms and managing workloads through September.

Roxby's promotion is part of that evaluation window. The right-hander gets a chance to audition for a future role, joining a rotation mix that includes Logan Webb, Landen Roupp, and Blade Tidwell on the upcoming schedule. The club has already cycled through multiple starters since the deadline, and Roxby becomes the latest to get a look.

Houser's injury removes a veteran presence from the rotation, though his season has been difficult. The forearm strain is the kind of diagnosis that often leads to extended absences, and the club will be cautious with a pitcher who has little to gain from rushing back in a lost season.

Whisenhunt's surgery decision ends his 2026 campaign and raises questions about his availability for next spring. Elbow ligament injuries carry long recovery timelines, and the distinction between full Tommy John surgery and an alternative procedure will determine how much of next season he misses. The club has not yet announced which path he will take.

Where the club stands

The Giants are 59-84, fourth in the NL West and eliminated from the division race. They are 16.0 games behind the Wild Card cut line, ranked 11th in the National League. They have won one game in a row.

The club hosts the Cincinnati Reds on Wednesday, with Logan Webb scheduled to face Nick Lodolo. The Arizona Diamondbacks arrive Thursday for a three-game series, with Landen Roupp and Blade Tidwell slated for the first two games.

The rotation depth chart has been rewritten repeatedly since the deadline. Mahle and Ray were traded away, and the club has leaned on a mix of established starters like Webb and younger arms like Roupp and Tidwell. Roxby's selection adds another name to the audition list, and the club will continue to shuffle the back end of the rotation as it manages innings and evaluates talent through the final month.

What we don't know yet

The club has not announced a timeline for Houser's return beyond the minimum two weeks required by the 15-day IL. Forearm strains vary widely in severity, and the Giants will likely provide updates on imaging results and treatment plans in the coming days. The nature of the strain and whether it involves any structural damage will determine how long he is out.

Whisenhunt's surgery type remains unconfirmed. MLB Trade Rumors reported that he will undergo surgery, but the club has not specified whether it will be full Tommy John reconstruction or an alternative procedure such as an internal brace repair. That distinction carries significant implications for his availability next season, with Tommy John surgery typically requiring more than a year of recovery and alternative procedures sometimes allowing for a quicker return.

Roxby's immediate role is also unclear. The Giants have not announced whether he will work as a starter or in long relief, though the rotation's depleted state suggests he could be stretched out for multiple innings. The club's upcoming schedule shows Webb, Roupp, and Tidwell as probable starters for the next three games, leaving Roxby's first appearance to be determined.

What to watch

Roxby's first outing will reveal how the Giants plan to deploy him. The club has flexibility with a 26-man roster through the end of August and will expand to 28 players on September 1, giving it room to carry extra pitchers and continue evaluating arms down the stretch.

Houser's imaging results and treatment plan will clarify his timeline. If the forearm strain is mild, he could return in mid-September for a handful of starts. If it is more severe or involves structural concerns, the club may shut him down for the season.

Whisenhunt's surgery announcement will set his recovery clock. The distinction between Tommy John and an alternative procedure will determine whether he is ready for spring training or faces a longer rehab that pushes his return into next season.

The Giants have five weeks remaining in a season that has become an extended audition for the future. Roxby joins a rotation that has been rebuilt on the fly, and his performance will help shape the club's offseason plans for a pitching staff that has been hollowed out by trades and injuries.