"We know there's competition there, but it makes both of us better," Allen said. "It's been like that all camp."
Rookie quarterback Matt Barkley will also get a lot of snaps on Thursday. Kelly hopes to get quarterbacks Dennis Dixon and G.J. Kinne into the game late in the second half.
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Brown's ankle is sore
Running back Bryce Brown injured his ankle during Monday's practice, but he was able to return to the field. He said after practice that his ankle was hurting him and that it's not at 100 percent. Brown told reporters he initially thought it was broken before relief set in when he was able to put pressure on it.
Brown is a valuable member of the Eagles offense, although his fumbling issues returned when he lost the ball into the end zone and missed out on a touchdown in Saturday's preseason victory over Jacksonville. Kelly said that there was not a problem with the way Brown held the ball on the fumble and that the defender made a nice play on the ball.
Still, Brown lost three fumbles last season and must fix the issue to be a trusted rusher for the Eagles.
"You've got to think about it always," Brown said. "You've got to make it happen. They preach it, preach it, preach it."
Kelly could be seen trying to strip the ball from Brown during Monday's practice. Kelly said the issue must be stressed with every player - not just with Brown.
"That's our responsibility," Kelly said. "We talked about ball security all the time. We do all security drills every day, and we'll continue to do that. But it's a fundamental thing. Once the season starts, we can't lose sight of it. It's integral in what we do."
Kelly's calls on cuts
The decision to cut Kenny Phillips on Sunday was because of the Eagles' depth at safety and Phillips' inactivity on special teams, Kelly said. Phillips was signed to compete for the starting job, but his injuries were an issue throughout training camp.
Kelly praised Brad Wing, who lost out to Donnie Jones in the punting competition. Kelly preferred Jones' experience and punting inside the 50-yard line, although he said Wing has "big potential" in the NFL.
The roster spots that Kelly said would be most difficult to reduce will be at safety, tight end, defensive line, and offensive line because of the depth at those spots.
Offensive linemen Allen Barbre and Matt Tennant did not practice Monday because of illnesses. They were the only players without long-term injuries who were absent.
The Eagles drew 12,000 fans to Monday's open practice at Lincoln Financial Field. They had a total of about 110,000 fans at the five open practices this summer.