San Francisco 49ers RB Isaac Guerendo suffers torn pectoral muscle injury
Yahoo Sports • 1 min read • Latest: Jun 1, 2026, 12:55 AM
Last updated Jun 1, 2026
San Francisco 49ers running back Isaac Guerendo has suffered a torn pectoral muscle, confirmed by head coach Kyle Shanahan. The injury, incurred while lifting weights, has slowed Guerendo's development and led the team to sign veteran backs Jordan Mims and Jermar Jefferson for depth. Guerendo's brief career has seen him struggle with injuries, with a lack of touches last season and a series of previous setbacks. The 49ers hope to have Guerendo back by the end of training camp, but his injury record raises questions about his future with the team.
- •Isaac Guerendo suffered a torn pectoral muscle while weightlifting.
- •San Francisco signed Jordan Mims and Jermar Jefferson for running back depth.
- •Guerendo averaged five yards per carry in his 2024 rookie season.
- •He had zero offensive touches during the 2025 season across 14 games.
- •Team anticipates Guerendo's return by the end of training camp.
- 12:55 AMYahoo Sports — The Downstream Impact of Niners RB Isaac Guerendo’s Injury
"A torn pectoral muscle stalls the rookie’s development, forcing San Francisco to sign veteran reinforcements as the promising back faces another uphill battle to secure his roster spot.
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