The Reds placed McLain on the 10-day injured list with a strained calf, Charlie Goldsmith of Fox 19 Now Cincinnati reports.
McLain was unavailable Thursday because of the injury and ultimately wasn't able to avoid a trip to the injured list. The 26-year-old has seen his role reduced, as McLain had started only five of the Reds' last 12 games before his placement on the IL. Calf strains typically result in longer than 10-day absences, but it's unclear how severe McLain's strain is.