The A's placed starting pitcher Sonny Gray on the 15-day disabled list Sunday, a day after leaving his start with soreness in his right forearm.

Oakland's ace left after five innings after feeling soreness in his right extensor muscle while giving up two runs and five hits in Oakland's loss to the Cubs.

The injury is the latest setback in a disastrous season for the 26-year-old Gray, who already has been on the DL because of a right shoulder injury.