Wells has been placed on the minor league disabled list with a right elbow strain. The right-hander had been pitching at Triple-A Iowa.
“I haven't talked to the doctor directly about it but it's something that's been bothering him and it kind of reached a critical point the other day,” president of baseball operations Theo Epstein said.
Wells was 1-2 with a 5.34 ERA in 12 outings (four starts). At Iowa, he was 3-3 with a 7.89 ERA over nine starts.