"Just didn't feel right," Cash said. "So we'll have more in the next two or three days. ... He just didn't feel as good as he was hoping. Any time you're dealing with a pitcher's arm, it's obviously concerning."
When asked if Cobb's situation would dictate him getting shut down for a couple of days and going to see a doctor, Cash answered: "I think probably all of the above."
Cobb did not even try to throw on Sunday.
"Never got to throwing," Cash said. "Just came in and didn't feel right."
Cobb initially began to feel the effects of his injury during a March 17 Spring Training game against the Phillies in Clearwater, Fla. He went to Spring Training slated to be the team's No. 1 starter and was even announced as the Opening Day starter.
Cobb was one of four Rays starters to begin the season on the disabled list, along with Drew Smyly (left-shoulder tendinitis), Alex Colome (pneumonia) and Matt Moore (Tommy John surgery).
Smyly and Colome are back in the rotation.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.