If a player is on the 40-man roster and gets injured in an MLB game (or MLB spring training), then he can only go on the MLB DL. The only way to avoid that would be to waive/DFA him to remove him from the 40-man roster and then you could put him in the minors and on the DL (although I'm sure if that happened in real life, the MLBPA would get upset at the team).
Basically, a guy on the 40-man roster in spring training IS in the majors, and has to be treated as such.
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