Chris Johnson was diagnosed Thursday with a concussion.

Johnson was diagnosed Thursday with a concussion.

Analysis:

Johnson took an elbow to the head during Thursday's practice and will be held out of on-court activities until he completes the league's concussion protocol. Timetables for head injuries can be quite volatile, so it's difficult to project with much certainty when Johnson will be back out there for the Jazz. The 25-year-old is aiming to win a back-end roster spot.