Manager John Gibbons didn't know exactly how the injury occurred, but it doesn't sound serious and for now it appears as though Rasmus will be listed as day to day.
"He was a little tender, non-throwing shoulder, no big deal, so we just made the switch," Gibbons said. "He felt it yesterday after the game. Today it was bothering him a little bit."
Rajai Davis replaced Rasmus in center, and that's a role Davis should get used to, as he's set to start the year in a reserve role.
Rasmus has appeared in three games so far this spring and is batting .200 (1-for-5) with three RBIs and three walks while striking out twice.
The 26-year-old hit .223 with 23 homers and 75 RBIs in 151 games last season. He will begin the year as Toronto's everyday center fielder.