Redskins receiver Pierre Garcon is a longshot to play against the New York Giants Sunday, but he did take a pain-killing shot Wednesday that doctors hope will lessen the pain in his right foot.

Garcon did not practice Thursday — he was not on the field, either, as they kept him inside to get treatment — and is not expected to practice Friday, coach Mike Shanahan said.

“We’re going to keep him off his feet and see how he feels,” Shanahan said. “We want to get that foot well. The only way to get it well is to rest him. I won’t call him out, but it’s a longshot for now.”

Garcon has missed three of the Redskins’ first six games because of his right foot — he injured the second toe on that foot in the season-opening win at New Orleans.

Shanahan said Garcon has taken a pain-killing shot earlier this season, but said the latest one was more localized.

Shanahan said he’s not sure how much rest it will take to get Garcon healthy.

“I wish I knew,” Shanahan said. “Initially we thought it would be a couple days and it would get better. Obviously it hasn’t gotten better, it’s gotten worse. Hopefully with a few days rest it’ll get a lot better. Who knows? We’ll wait and see.”

Also, in other injury news: safety Brandon Meriweather (knee) is out; corner David Jones (Achilles) did not practice; fullback Darrel Young (hamstring), punter Sav Rocca (right knee), corner Cedric Griffin (hamstring), corner DeAngelo Hall (knee) and defensive end Doug Worthington (calf) were limited.