Denver Broncos offensive coordinator Adam Gase has said that the Baltimore Ravens' key players have changed since the sides last played.
Since winning the Super Bowl in February, the Ravens have lost Anquan Boldin, Ray Lewis and Ed Reed, while Elvis Dumervil and Brandon Stokley have moved to the club.
Gase told the Broncos' website: "A lot of their key players, the guys that kind of were impact players, have changed. So we're going to have to feel this out and see how this personnel group handles what we're going to do."
The Broncos lost in overtime to the Ravens in the playoffs at the start of the year.
The two sides meet in the opening game of the 2013 season tomorrow night.
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