Matt Cain has been dealing with ongoing inflammation in his right elbow and will visit Dr. James Andrews.
Cain is owed $67.5 million after this season, including a buyout of a $21 million club option for 2017.
The right-hander has a 4.18 ERA, 1.251 WHIP and 70 strikeouts in 90.1 innings in 2014.