Ill Albert Haynesworth on sideline

ASHBURN, Va. -- Albert Haynesworth was sidelined after just a few snaps at practice Tuesday morning, apparently because he wasn't feeling well.

The Washington Redskins defensive tackle began the workout as usual, taking part in defensive drills, but he was out of his pads and standing on the sideline with a towel on his neck shortly after the 11-on-11 plays began.

Haynesworth remained with his teammates until the end of practice and referred questions to coach Mike Shanahan.

"I just think he wasn't feeling good," Shanahan said. "The doctors didn't feel like it was heat-related. He just was sick."

Haynesworth missed the first nine days of training camp practices because he had to pass a conditioning test. He has since been working mostly with the second-string defensive line.

Linebacker Curtis Gatewood, who suffered from heat exhaustion Monday, also didn't practice. Receivers Malcolm Kelly (hamstring) and Mike Furrey (concussion) remain sidelined. Veteran defensive players London Fletcher and Vonnie Holliday were given the day off.

The practice was a sloppy one, with players on both sides of the ball losing focus as the team worked on varying snap counts at the line of scrimmage. At one point, Shanahan called the entire team together and gave them a quick lecture on concentration.

"What you do, if you're making a few mistakes, you stop practice and you emphasize the point you're trying to get across," Shanahan said. "I did that a couple of times today. This is usually the week where everybody's a little bit sore and everybody's looking for camp to get over with."