Felix Rosenqvist is not allowed to drive this weekend's Indycar race in Elkhart Lake in Wisconsin.
He was stopped by the racing series' medical team after the crash in Detroit last weekend, his media manager writes in a press release.
He is replaced by the Dane Kevin Magnussen.
It was on the Road America track in Wisconsin that Rosenqvist took his first, and so far only, Indycar victory last year.
ARCHIVE: Felix Rosenqvist in serious crash (June 12)
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Felix Rosenqvist in serious crash