According to a team spokesman, Nash will be examined Monday by back specialist Dr. Robert Watkins.
Nash played 13 minutes, scoring two points without hitting a field goal in three attempts. He also had three assists and two turnovers.
The Lakers have kept Nash out for two games this season as a precautionary measure -- opting for rest when the team plays on back-to-back nights.
Last season, Nash sat out 32 regular-season games, most after breaking his leg in the second game of the year.