The Giants placed Winn on the 15-day injured list Sunday due to a right elbow strain.
It's uncertain when exactly the right-hander sustained the injury, but he last pitched Monday against Washington and surrendered three runs across two-thirds of an inning. According to Alex Pavlovic of NBC Sports Bay Area, manager Tony Vitello said an MRI on Winn's elbow didn't reveal anything overly concerning, leaving the Giants optimistic that the 28-year-old will be in line for a short-term absence. Winn will be eligible for reinstatement June 26.