Arrington was scheduled to miss 2-4 weeks after the surgery but the Redskins training staff felt he needed to rebuild the strength in his leg, first.
"He needs more strength in his quad for him to stay out on the practice field," said Bubba Tyer, the Redskins' director of sports medicine. "We'll just take it day to day with him."
Meanwhile, the Redskins definitely will be without rookie first-round pick Sean Taylor. The hard-hitting safety was arrested for drunken driving early Thursday. Making matters worse, he was incognito for most of the day before finally showing up at team headquarters long after Thursday's practice had ended.
In turn, Redskins coach Joe Gibbs has said he would inactive Taylor.
"You don't ever want (this). On this football team, we've got some of the neatest people I've ever been around," Gibbs said after practice. Gibbs added that the team has "great character guys and people that care a lot about the football team. I hurt for the team, and you don't like to see somebody in trouble, either. You hurt for the person. So we'll just try and deal with all of it as best we can."
A first-time offender, Taylor faces a $2,500 fine and/or a year in prison.
Defensive end Phillip Daniels, who has missed the last four games with a groin injury, said of Taylor: "Being out Wednesday night, after 2 (a.m.), there's nothing good going on out there. It's time to be home. We have a big game this week, there's no reason to be out late on a Wednesday night.