The LSU product tore both his ACL and LCL while returning a free kick during Arizona's 30-10 triumph over the St. Louis Rams last Sunday in Glendale.
"This will be a long one, "Arians said via espn.com.
Mathieu was enjoying an excellent rookie season with the Red Birds. He was named Defensive Rookie of the Month for October and was second on the team in tackles. Mathieu was a steal as a third round draft choice this past April and will be sorely missed.
“He's been fantastic and he's a leader,” Arians explained. “Very seldom do you see young guys come in and become a leader like he has, especially in the secondary. His personality is infectious with the guys because he loves football. He'll stay out there and practice all day and go as hard as he can. Those are the guys you miss.”
That's for sure.
Rashad Johnson will take over for Mathieu as the starting free safety.
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