ASHBURN, Va. -- Washington Redskins defensive tackle Albert Haynesworth has been sidelined for another practice, this time with lingering effects from dehydration.

Haynesworth was a spectator again during Wednesday's workout. He stood to the side, flipping through the pages of a play book titled "Washington Redskins Defense 2010 Training Camp."

Haynesworth had to stop practicing early during Tuesday's session. Coach Mike Shanahan said he didn't think at the time that it was heat-related because Haynesworth "was only out there for about 10 minutes." The trainers later said Haynesworth was indeed dehydrated.

Haynesworth missed the first nine days of training camp practice because he failed a conditioning test and was hampered by a sore knee.