Collison is dealing with left shoulder stiffness and is considered doubtful for Tuesday's game against the Mavericks, Jason Jones of the Sacramento Bee reports. This is the first we're hearing of the injury, which likely isn't anything too serious. Regardless, Collison appears unlikely to play Tuesday, which should elevate Ramon Sessions into the starting lineup. In his first season with the Kings, Collison is averaging 14.7 points, 6.3 rebounds and 4.0 assists through seven contests.