Bailey exited Sunday's Las Vegas Summer League loss to the Clippers with back spasms and did not return, Sarah Todd of The Deseret News reports.
Bailey only managed to make it through eight minutes before aggravating his back, and it's already been announced he will miss Monday's meeting with the Bulls. The Jazz will likely be extra cautious with Bailey's back issue during these exhibition games, so for now, he should be considered doubtful for Wednesday's game against the Spurs.