Onwuasor (hamstring) has been ruled out for Sunday's matchup against Kansas City, Rachel Gossen of the Raiders' official site reports.
Onwuasor is set for his second consecutive absence after suffering the hamstring injury in Week 12. He failed to practice in any capacity this week, so his potential to return in Week 15 is also unclear. K.J. Wright should be in for a heavy workload against Kansas City with Onwuasor sidelined.