The French striker has moved to St James' Park from QPR on a season-long loan, but will miss out when the Magpies start their Premier League campaign at Manchester City on 19th August, which you can see live on Sky Sports 1.
"It's just a strain, but it's an area that is stopping him from running at the moment," Pardew told the Newcastle Chronicle. "We need to get some work into him.
"There is no chance of him making Man City. Whether there is a chance of him playing against West Ham in the next game is something we will have to suck and see as we go along."
Pardew also hinted that Newcastle are looking to reinforce their forward line before the end of the current transfer window.
He added: "We look like we need a bit of improvement at the top of the pitch. We have Remy in and unfortunately he's injured, so that's still an area we need to improve on.
"I think there is a lot of players still to move in this window. I think we will be involved in that."