"I think sometimes you get too comfortable and you forget about doing the things that got you there," Shanahan said. "You have to have a mindset that you can't be too secure."
The Broncos were touted as Super Bowl candidates all offseason. After an 18-10 loss to St. Louis, those thoughts seem distant. The Broncos turned the ball over five times, including four by quarterback Jake Plummer.
Defensive end Ebenezer Ekuban said he was disappointed with the team's play in the season opener.
"You can't let games like this get away from you," Ekuban said. "You look at our schedule, this is a game we had to have to build momentum. Every game is critical. We can't sacrifice games thinking 'You know what? We're going to be 12-2 or 12-3 the rest of the year.' You can't do that."
Plummer's play was the lowest point of the ugly loss. Plummer threw three interceptions and lost a fumble, but Shanahan said there was no reason to meet with Plummer this week.
"You don't have to say anything to Jake," Shanahan said. "Jake knows his first assignment is to protect the ball."
--Running back Mike Bell fractured the tip of his right middle finger and the bone broke through the skin, but he stayed in Sunday's game and shouldn't miss any time with the injury.
"It looked like it went back in place," Shanahan said. "He should be able to go."
--Shanahan said he would continue to use Tatum Bell and Mike Bell as he did in the first game. Tatum Bell will start, Mike Bell will rotate series with him and Shanahan could stick with one of them over the course of a game if either gets hot.
"I've still got to go out and compete every day," Tatum Bell said. "But instead of going two, I'm going one."
"We have a week to prepare for somebody, so it will be easier," Shanahan said.
--DE Courtney Brown was held out of Sunday's game because the Broncos didn't want to risk him re-injuring his knee on the artificial turf at St. Louis. Brown might play this week against Kansas City.
--WR Brandon Marshall, who missed most of the preseason with a knee injury, was inactive for the season opener. Shanahan said Marshall needed more time to get back into football shape before the team considers him for a role on gameday.
--RB Mike Bell said he felt comfortable rotating series with Tatum Bell. He said it allows him to watch starter Tatum Bell and get a feel for the flow of the game from the bench.
--DT Gerard Warren, who missed most of the preseason with a dislocated toe, played against St. Louis and came out of the game without any more health problems.
--CB Champ Bailey had a solid all-around game against the Rams. He
led the team with nine tackles, including a few nice open-field tackles
on big Rams tailback Steven Jackson. Bailey's strength is covering
receivers but he is a very good tackler.
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