DENVER, CO - SEPTEMBER 23: Quarterback Peyton Manning #18 of the Denver Broncos runs the offense against the Houston Texans at Sports Authority Field at Mile High on September 23, 2012 in Denver, Colorado. The Texans defeated the Broncos 31-25. (Photo by Doug Pensinger/Getty Images)
Manning said Wednesday that while everybody was focused on his arm strength upon his arrival in Denver seven months ago, the biggest thing on his mind was working with his new snapper to get the center-QB exchange down.
So, Manning and Walton spent endless hours working together on local high school football fields and then at the Broncos' headquarters.
The Broncos signed Koppen three weeks ago and he went in just before halftime Sunday against Oakland when Walton broke his left ankle.
Koppen spent his first nine seasons with the New England Patriots (2-2), whom the Broncos (2-2) face Sunday.
(Copyright 2012 The Associated Press. All rights reserved.)