Robinson was added to the injury report, which lists him as questionable.
That means Robinson has a 50-50 chance of playing Sunday, although he believes the odds are a lot higher.
"I'm going to play on Sunday," Robinson said after Thursday's practice. "I just don't want to chance anything. I'm just trying to be cautious."
Robinson said he hurt the hamstring in last Sunday's win over San Francisco, and that it started to get tight during the week.
Bobby Engram is Robinson's backup, while No. 4 receiver Alex Bannister would see an increase in playing time if Robinson were unable to play.
- LOOKING FOR MORE: Defensive coordinator Ray Rhodes made a rare appearance in front of the media Thursday and said that the Seahawks' defense has room for improvement.
"We have a long ways to go," Rhodes said in his first public comments since Aug. 20. "On a daily basis, I look at what we're doing, where we are, where we want to be, and right now we still have a lot of work to do. It's a long season. I keep telling the guys that if we keep working, we'll be where we want to be."
Seattle ranks 13th in the NFL in defense, giving up 310 yards per game.
- GAME TO BE TELEVISED: The Seahawks met their deadline for a sellout Thursday, selling enough tickets to get the television blackout lifted.
A limited number of tickets still remain for Sunday's game.
- QUICK SLANTS: Running backs Shaun Alexander (ankle) and Mack Strong (knee) returned to practice Thursday, along with cornerback Willie Williams (knee). ... Defensive tackle Rashad Moore missed Thursday's practice due to the flu. ... Fans attending the game are encouraged to bring non-perishable food items as part of the "Tackle Hunger" program.