Tyrann Mathieu tore his ACL on a late interception in the Arizona Cardinals' win at the Philadelphia Eagles.

Mathieu has been one of the NFL's best defensive backs this season.

Bruce Arians says he loves the fact that Mathieu has used his second chance perfectly, becoming a leader and a great player. 

“It’s his energy and passion, at everything,” said Arians. “He’s just so good to be around, for us coaches and for his teammates. He wants to be great every day. I mean, we could lose Carson [Palmer], or Patrick [Peterson], and it’d be devastating. We could replace Tyrann, but who would replace his interceptions and his sacks? I have to say, he’s my favorite. This would be devastating for him.”