Adam Eaton's elbow just irritated

PHOENIX -- Arizona Diamondbacks outfielder Adam Eaton's injured left elbow has an irritation but no structural damage, the team said Thursday.

Still, it's a setback for Eaton, who has been on the disabled list all season. The Diamondbacks say he will spend two to three weeks doing strengthening exercises, then begin a throwing program.

Eaton was within days of his scheduled return to the Diamondbacks when he felt discomfort in the elbow during a rehab start Monday for Triple-A Reno. He returned for an examination Tuesday and received treatment, but the elbow did not react well.

Eaton told azcentral.com that the discomfort was in a different area of his elbow.

"It just feels like someone punched me in the stomach," he said. "It's tough to have a setback like this, but I have to try and learn what I can during this and go forward. Try to take as much good out of a bad situation."

The rookie had been slated to start in center field and bat leadoff this season.