The Cubs placed Boyd (knee) on the 15-day injured list Wednesday, retroactive to Monday.
The move comes after Cubs manager Craig Counsell announced that Boyd will undergo surgery to repair a meniscus injury in his left knee. The veteran southpaw's recovery timeline will come into better focus once he undergoes the procedure, and there remains a possibility that he will be available to pitch again this season, though that may not happen until after the All-Star break. Jordan Wicks (elbow) is on a rehab assignment and is inching closer to being activated from the 15-day IL, but the Cubs may have to turn to an arm from Triple-A or a bullpen option like Ben Brown or Javier Assad to fill in for Boyd in the short term.