The Patriots initially listed him as having practiced for a third straight day on a limited basis on Friday, but later issued a correction, saying he did not participate (DNP). The questionable designation puts Hernandez's chance of playing on Sunday at 50 percent.
The third-year tight end has missed three consecutive games after leaving the team's Week 2 contest against the Arizona Cardinals with a right ankle injury.
The team will travel to Seattle on Friday, and head coach Bill Belichick said Hernandez could be a game-time decision.
"We'll just have to see how it goes here," Belichick said Friday morning. "He practiced late last week and did some things yesterday and Wednesday. We'll see how he is today and see if it set him back, or didn't set him back, and how that went. We'll have the day to evaluate it on Saturday, and we'll see where we're at on Sunday. It could be a game-time decision."
In addition to those listed as questionable, the team declared both safety Steve Gregory (hip) and linebacker Tracy White (foot) out for the game.