The lingering soreness has been a mystery, and while previous MRIs didn't reveal any major structural damage, the exploratory surgery, scheduled for Wednesday, will help determine exactly what went wrong.
"Travis is going in for exploratory surgery, a scope, because they can't pinpoint anything," Blue Jays manager John Gibbons said.
"The original [injury], he took a ball off the collarbone. He tried to play through it, took a while, came back strong and then one swing."
Travis has been dealing with a left shoulder injury since late April, when he was hit by a line drive during a game against the Indians.