Robinson is listed as questionable on the Vikings' injury report for Monday night's game against New England and almost certainly won't play. The question is how many games will Robinson miss.
Although it's not believed to be a related injury, Robinson underwent surgery to repair a herniated disk in his back in 2000 and again in 2001.
Last Sunday's game marked the first time the Vikings have had five receivers active for a game. They likely would go back to having four in uniform on Monday night. That list would include Troy Williamson, Travis Taylor, Billy McMullen and Bethel Johnson.
Williamson, Taylor and Johnson joined Robinson on the team's injury report. Williamson and Taylor both suffered concussions in the first quarter at Seattle, and Johnson is listed as having a hamstring injury.
Johnson, however, said he was fine Thursday, and Taylor is probable. Williamson was downgraded from probable to questionable Thursday but said he would be ready to go.
Williamson was knocked out when he was hit by Seattle safety Ken Hamlin and did not return. One play after Williamson was injured, Taylor was drilled by cornerback Kelly Herndon. Taylor, though, continued to play.
Coach Brad Childress did not seem concerned about his receivers when asked Thursday.
"I am confident in everybody we put out there," he said. "It doesn't make any difference. There is an attitude that guys are going to get nicked and they are going to go down. We don't like it, but the next person steps up and fills the bill. We'll make decisions on who those people are at the end of the week."
If Taylor or Williamson is slowed, Johnson could see a bigger role in his second game in the Vikings' West Coast offense. He did not catch a pass in Seattle. McMullen, meanwhile, hasn't seen extensive action but does have six catches.