Dolphins running back Jay Ajayi diagnosed with concussion

DAVIE, Fla. (AP) Miami Dolphins running back Jay Ajayi has been diagnosed with a concussion and will miss several practices.

Ajayi, who ran for 1,272 yards last season, sat out Wednesday's workout after being hurt Monday.

Safety Reshad Jones practiced for the first time in training camp after being sidelined with a calf injury. He started camp on the active-non-football injury list.

Ajayi's injury will mean more snaps in practice for backups Kenyan Drake and Damien Williams.

---

For more NFL coverage: http://www.pro32.ap.org and http://www.twitter.com/AP-NFL

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide—from Peter King, Tom Verducci, Lee Jenkins, Andy Staples, Grant Wahl, and more—delivered straight to you, along with up-to-the-minute news and live scores.