Chamberlain dislocated his right ankle bouncing on a trampoline with his son on March 22. The right-hander has resumed working out at the Yankees' minor league complex, where he played catch in the outfield on Friday with his right knee on a stool.
Chamberlain said the ankle continues to improve and that his throwing arm is 100 percent. The 6-foot-2, 240-pound right-hander was working his way back from elbow ligament replacement surgery and was expected to return in June.
"It's a little stiff, but good," Chamberlain said of the ankle.
Also, Andy Pettitte made 66 pitches over 5 2-3 innings in an extended spring training game. The left-hander, who ended a one-year retirement last month, said he expects to pitch at a higher classification, likely Double-A Trenton, in his next start.
"Just another positive step," Pettitte said. "I'm happy. I felt pretty comfortable with all my pitches."
In the game against Pittsburgh minor leaguers, Pettitte struck out five and allowed two runs on five hits. He could be ready to pitch in the majors next month.
Michael Pineda, on the disabled list because of right shoulder tendon inflammation, is scheduled to throw two innings in his first extended spring training game on Saturday.
Pineda has been out since experiencing discomfort in the back of the shoulder during a spring training start on March 30.