Dr. David Altcheck, who performed Braden's shoulder capsule procedure last May, administered the shot and recommended the downtime to relieve the strain in the pitcher's shoulder.
Before Braden's setback, suffered the day after a bullpen session in Arizona while the club was in Japan, the A's had hoped to welcome him back in the rotation at the beginning of May. Now, June may be a more realistic timeline, considering Braden will have to restart his throwing program once cleared to do so.
For the time being, he's limited to strengthening activities.
"The schedule he was on, obviously we're not on any more," manager Bob Melvin said. "We're not even looking at a schedule right now, just seeing how he feels."
Braden is nearly 11 months removed from his surgery, one familiar to Mets left-hander Johan Santana, who needed 18 months to recover from a similar procedure. Santana, who last pitched in a Major League game Sept. 2, 2010, is scheduled to be New York's Opening Day starter Thursday.