CLEVELAND -- Red Sox lefty Felix Doubront is progressing well in his return from a left shoulder sprain and will start a Minor League rehab assignment on Thursday for Double-A Portland.
"He threw the ball well," said manager John Farrell. "He feels confident that the arm speed is getting out of his hand consistent with outings prior to coming off the mound. He's scheduled to start Thursday with Portland to begin his rehab process."
There is no word on how many rehab starts Doubront will get before returning to the Red Sox.
Doubront is 2-4 with a 5.12 ERA in nine starts.