Percy Harvin, who suffered a sprained ankle on Sunday that had him on crutches Monday, isn't expected to participate in practice until at least Friday, if at all.
"Percy is doing better. He won't practice today. We'll take it day-to-day and see how he feels tomorrow, but he is making improvements," Vikings coach Leslie Frazier said.
Harvin leads the NFL with 62 receptions and has caught a pass in all 56 games he has played in his career, including the playoffs. His 35.9-yard kickoff return average this year also leads the league.
"I'm shooting to try to play and get everything I can," Harvin said Monday. "If I can't, then I'll have to rest it. But I'm not ruling myself out."
If Harvin isn't able to play Sunday against the Detroit Lions, rookie fourth-round draft choice Jarius Wright is expected to be active for the first time in his career.
"He's going to prepare just in case Percy is not able to make it," Frazier said. "He'll be part of the game plan as we prepare for Detroit.
"They are very similar in a lot of ways. The way we would use him is similar to the way we use Percy if he ends up playing on Sunday."
The other player the Vikings might not have in practice until at least Friday is starting nose tackle Letroy Guion, who suffered a turf toe injury at the end of the first on Sunday in Seattle and continued playing until the end of the game. But Frazier said the injury did limit Guion's effectiveness, especially at the end of the game when the Seahawks were able to end the game with a 12-play drive to wrap up their 30-20 win.
"I'm hoping that they both make it. I'll learn more as the week goes on, but I'm hoping by Friday they can both participate to some degree. We'll see," Frazier said.
Tight end John Carlson, who missed the last two games with a concussion, returned to practice on Wednesday.
"It'll be huge," Vikings quarterback Christian Ponder said of Carlson's return. "Great tight end and we're going to do some different things with him, but, yeah, we're happy to have him back and he can only add another element to this offense."
Tim Yotter is the publisher of Viking Update. Follow Viking Update on Twitter and discuss this topic on our message boards. To become a subscriber to the Viking Update web site or magazine, click here.