Kurt bush has not been approved by NASCAR Medical Staff----
To Participate in Sunday's Pocono race.
23xi Driver was replaced by 19 year old Ty Gibbs, who has got 18th position in the race.
Bush, 43, who has indicated that next season will be his last driving in NASCAR,
tweeted that he suffered "concussion-like symptoms" from a hit during Saturday's qualifying season.
Bush, who made 776 Career Cup debuts,is the 2004 Series champion and
and is driving in his first season for the team co-owned by Michael Jordan and Denny Hamlin.
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