"His Opening Day start is definitely in jeopardy," A's manager Bob Geren said Wednesday.
Duchscherer had an MRI exam Tuesday and it showed no significant damage. A doctor recommended the two-time All-Star rest his arm for a week.
Duchscherer will visit Los Angeles Angels team doctor Dr. Lewis Yocum. The pitcher has yet to appear in a spring game.
The Athletics ace has been on the disabled list four times in the last three years. He was 10-8 with a 2.54 ERA in 22 starts last season and was 0-3 in his final seven starts.