The New York Islanders spent a good portion of the 2019-20 season flipping between Semyon Varlamov and Thomas Greiss in the crease. Barry Trotz clearly wanted to continue the goalie rotation that the Isles had with Robin Lehner and Greiss in 2018-19.
Last season, Lehner and Greiss split the starts with 43 and 39, respectively. This season the starts between Varlamov and Greiss were split a little less evenly. Varlamov had a majority of the start with 39 to Greiss's 29.
That split wasn't due to injury. Greiss was healthy the entire season, except for that dizziness spell in November where Greiss pulled himself from the game.