Castle (migraine) is questionable for Saturday's game against the Timberwolves, Paul Garcia of ProjectSpurs.com reports.
Castle is a late addition to the injury report, so his status will be worth monitoring closely ahead of Saturday's 8:00 p.m. ET tipoff. Julian Champagnie and Keldon Johnson figure to be the top candidates to enter the Spurs' starting lineup if Castle is not cleared to play.