DETROIT -- Boston Red Sox pitcher Clay Buchholz didn't take part in his planned outing in the bullpen Saturday afternoon, leaving his scheduled start at home Tuesday against the Colorado Rockies in jeopardy.
"Obviously, right now, he's not going to start on Tuesday," Boston manager John Farrell said while addressing the media prior to the game with the Detroit Tigers. "Basically what we're doing is going as tolerated with throwing. It's likely at some point we're going to have to get him out on a rehab assignment and at least one start for now."
Buchholz has been on the disabled list retroactive to June 9 with a strained trapezius muscle in his neck.
The plan was to have him throw a three inning, 45-pitch bullpen session on Saturday.
"It's just not quite to the point where I can get on the mound right now," Buchholz said. "I'm still trying to feel it out, I guess. It's taking a bit longer than I want it to. It's definitely making progress in the right direction."
On Thursday, Buchholz threw from about 100 feet on flat ground. He did some flat ground work and some long toss on Saturday.
"The intensity went up today without any more soreness than yesterday or the day before," Buchholz said. "Moving forward just not as a quick pace as I'd like. If it's time that needs to help it heal, then we've just got to give it a little more than we were expecting."
"It feels good to go out and throw, but then it'll take one throw when it feels good and then when I try [something different] I still feel it," Buchholz continued. "I don't know if it's me throwing that's causing it to delay it a little or what. That's the only way I can feel it or test it is if I go out and throw."
Buchholz last pitched on June 8.
"I want to be 100 percent off the mound before I get into a game," Buchholz said. "If it's the case and I don't feel anything tomorrow and I can throw as hard as I want and have the feel that I need, then that might be different."
There is no timeframe for a trip to the minors.
"We've got to get him on the mound first and build from there," Farrell said. "I don't know if we had a point in time on the calendar that we thought we'd have him back, but it's going slower than we had anticipated."
Farrell said there has been no talk of having Buchholz looked at again by a doctor.
"The information we've gotten and he has gotten is that there would be no more risk of damage, but at the same time it's on the throwing side of his body and if he's not comfortable, we're not going to jeopardize it in any way," the manager said.
The injury news continued to get worse for Red Sox pitchers on Saturday night.
Relief pitcher Franklin Morales could be forced to miss some time after he injured a muscle around his left armpit in the 10-3 loss to the Tigers at Comerica Park.
"He felt a little discomfort in that left shoulder [area]," Farrell said. "It will be re-examined here tomorrow, but there's potential for the DL."
Morales, who had a left shoulder injury in 2012, was just reinstated on May 28 after missing 52 games with a lower back strain. He had been placed on the DL retroactive to March 22.
His return from the DL was delayed when a left pectoral strain was discovered while he was still out with the back strain.
"It's hard to be real specific right now," Farrell said when asked where the injury was this time.
Morales tended to think it was in his left pectoral muscle.
"I feel a little soreness," Morales said after the game as he pointed to the injured area. "He wants to check it out tomorrow."
Chuck Pleiness is a contributor to ESPNBoston.com.