WASHINGTON -- Right-hander Jhoulys Chacin will throw a two-part bullpen session on Thursday, when the Rockies have an optional workout at Coors Field, as part of his comeback from a nerve damage issue in the right side of his chest.
Chacin, who was expected to be a staff leader but was 0-3 with a 7.30 ERA in five starts before going to the disabled list, has been gradually regaining arm strength.
The bullpen session will be interrupted in the middle with a rest period to simulate what happens between innings.
"All indications, from what I hear, is that he's coming, his arm strength is coming back, the ball is coming out of his hand better than it had been," Rockies manager Jim Tracy said.
Tracy also said catcher Ramon Hernandez caught seven innings for Triple-A Colorado Springs on Friday as part of his rehab assignment for a left hand strain. Tracy said he has not determined the playing time between Hernandez, the Opening Day starter, and rookie Wilin Rosario, who has made dramatic strides in Hernandez's absence, but he will be careful not to overuse Hernandez and possibly create another injury.