Coach Pete Carroll confirmed Monday that Penny will require surgery to repair damage to his fibula and tibia. Penny will have the surgery Tuesday morning, according to NFL Network.
Penny was injured in the third quarter of Sunday's 39-32 loss at New Orleans and was carted to the locker room.
"It's going to be a haul for him. This is what they refer to as a tib/fib incident. He broke his fibula and cracked that, but it's the high-ankle sprain element of it that makes it difficult. And there's a particular surgery that they do to connect and tighten down those bones," Carroll said on Seattle Sports 710 AM.