Joba Chamberlain, who suffered a freak ankle injury on a trampoline in March, hopes to return to the Yankees in the second half of the season. The right-hander believes he is two to three weeks away from going on a minor league rehab assignment. "When I come in, hopefully they'll (be adding) a big part to the team," Chamberlain said. "I feel like I can help them... 100%." Chamberlain appeared ready to make it back to the big club in less than a year after last June's Tommy John surgery, but took a huge step back with the trampoline injury.