Santos, who has been out since April 21 with inflammation in his right shoulder, has once again begun a throwing program. He will eventually need to start throwing from 150-to-175 feet in order to build up arm strength before getting back onto the mound.
"He's started back up with the throwing program," said Blue Jays manager John Farrell, who added it's almost like Santos is starting over. "The last two times he has thrown the ball on flat ground, he has felt very good."
Santos was the Blue Jays' top acquisition during the offseason. He was obtained in a trade with the White Sox and was expected to serve as closer, but the native of California has appeared in just six games this season.
It's not how either side envisioned the 2012 season shaping up, but with Santos under contract until at least 2014, the Blue Jays want to ensure he is completely healthy before getting him back onto the mound.
Last season in Chicago, Santos posted a 3.55 ERA in 63 games while striking out 92 and walking just 29 in 63 1/3 innings.