Smith pulled his groin during last week's victory over the Tampa Bay Buccaneers and hasn't been able to practice this week.
The Redskins will have to cut a player to make room for Pakulak. Zorn said the move will be made Saturday.
Also, defensive tackle Cornelius Griffin was listed as questionable with an elbow injury. Tackle Chris Samuels, who sat out Thursday's practice with a knee problem, returned Friday and is probable.
Copyright 2009 by The Associated Press