Cissoko has been ruled out for Wednesday's game against the Clippers after entering the NBA's concussion protocol.
Cissoko played just two minutes in the Spurs' most recent game this past Saturday against the Pacers in France, but he may have taken a hit to the head at some point during his brief time on the court. His absence shouldn't open up any extra minutes for other players, as Cissoko hasn't been featured in the San Antonio rotation this season.