"We're going to back him off until Friday," said Red Sox manager Terry Francona. "We got him out to 120 [feet], he started going to 130. He's still feeling it a little bit. I think what our concern is, all of a sudden a guy is going to throw different, especially if you start getting out to where you're throwing it, and then he's going to hurt his arm. I think we felt we like we were fighting it. We didn't want to go this route, because it's just not the right thing to do."
Colon will go home for the All-Star break, and when the Red Sox arrive in Anaheim to start the second half, he will resume some sort of program. He injured his back in Philadelphia on June 16 while taking a hard swing in an Interleague contest.
The Red Sox are covered in the rotation at the moment, with Josh Beckett, Jon Lester, Daisuke Matsuzaka, Tim Wakefield and Clay Buchholz, who will be promoted from Triple-A Pawtucket on Friday.
All along, they have been conservative with Colon, who has had his share of arm problems in recent years.
What the Red Sox want more than anything out of Colon is for him to be healthy for the stretch run, when an experienced arm with big-game experience can be invaluable.
"We'll probably take a couple of days, kind of shake the cobwebs out and get him going again," said Francona. "Following it every day -- and [pitching coach] John [Farrell] is certainly the one that's there -- but you start running a risk, when a guy has got some things going on, of having other things going on. That's why we're trying to control this."
Before the injury, Colon was 4-2 with a 4.09 ERA in six starts.
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.