Wainwright was placed on the 10-day disabled list Sunday with right elbow inflammation.
Wainwright last pitched April 17 against the Cubs, allowing one unearned run on four hits and four walks while striking out five over five innings. There had been no talk of Wainwright dealing with any sort of injury prior to his placement on the disabled list, but manager Mike Matheny revealed the right-hander experienced the inflammation during a pre-start bullpen session Sunday, per David Solomon of 590 The Fan St. Louis. The move is retroactive to April 20, so the 36-year-old will be eligible to return May 1 at the earliest. Jack Flaherty is the most obvious candidate to replace the veteran in the rotation in the meantime.