Seattle Seahawks quarterback Russell Wilson exited Sunday's game against the San Francisco 49ers in the third quarter after suffering an apparent leg injury. 

It came on an Eli Harold sack, which showed Wilson's knee/ankle area being folded under the defender. Remember, Wilson suffered an ankle injury to the right leg in Week 1. Though, this injury is to his left leg and might be more related to the knee. 

Wilson was seen having a brace fitted for his knee on the sideline with rookie Trevone Boykin taking over under center.