Roberts announced the news during a call-in segment of the Scott Garceau Show on Thursday, and Andy MacPhail, president of baseball operations, confirmed the plan via text message.
Roberts also said during the show that he hopes to get back into games at some point this year despite his lengthy list of setbacks. He has already had two epidural injections and is on the 60-day disabled list with a herniated disc in his lower back. He had been progressing well enough to start a schedule to get into extended spring games in Sarasota, Fla., but he was scratched from his initial contest with "unrelated back pain" and hasn't played since. --Brittany Ghiroli