Dallas Braden will not join the A's on their season-opening trip to Japan.
Braden continues to rehabilitate his shoulder after season-ending undergoing surgery to repair a torn capsule last May.
REWIND: Braden undergoes successful surgery
Braden threw a bullpen session in Arizona Wednesday, and pitching coach Curt Young declared afterward that a trip to Tokyo with the team would make getting his regular work in too difficult.
"I'm fortunate enough to have been to Tokyo before, and what I need to do is get myself ready to pitch without any potential conflicts in my workout schedule," Braden told the San Francisco Chronicle. "It would behoove me to stay here."
Despite the news, Braden's bullpen session was considered a positive step towards the early May return the A's are targeting, as he increased his number of pitches and level of effort.
"What I've been feeling before and after these sessions is no pain and no discomfort," he told the Chronicle. "I want to make sure that doesn't go away. I'd hate to do too much and set myself back."
Braden, 28, was 1-1 in three starts before the surgery last year. In five MLB seasons with the A's, Braden owns a 94-79 career record with 305 strikeouts and a 4.16 ERA.
He threw MLB's 19th perfect game on Mother's Day in 2010.