Morrow has yet to take the mound, but has begun to throw from 150 feet as a way to build arm strength. There is still no timetable for his return, but the rehab process appears to be going well.
"We still go on how he feels when he comes in on a given day," Blue Jays manager John Farrell told reporters on Thursday afternoon. "His last time out, which was two days ago, out to 150 feet, he came back in and actually threw some flat ground.
"Everything feels OK. I will say this, he'll feel it occasionally when he sneezes. As crazy as that sounds, that's clearly all linked into the core."
Morrow won't start throwing off a mound until he is completely symptom free. He still faces a long rehab once he's finally able to start throwing with more intensity, but the latest news is still encouraging.
The 27-year-old Morrow sustained the injury during a game against Washington on June 11. He was originally expected to be out until at least late August, but that estimated timeframe could be moved up if things continue to progress in the next couple of weeks.
"I think, given the way he walked off the mound and given the way he felt in the following five-to-seven days, I know we haven't put out a timeline here, but it sounds like to me that he's moving along ahead of what maybe our initial expectations were," Farrell said.
Morrow was the Blue Jays' most valuable pitcher this season prior to his injury. The native of California went 7-4 with a 3.01 ERA while striking out 67 in 77 2/3 innings.