Newcastle manager Alan Pardew fears he could be without key man Hatem Ben Arfa for Saturday's visit of defending Barclays Premier League champions Manchester City.
The winger, who returned from four games on the sidelines to score in the 2-1 defeat by Fulham on Monday night, risks missing out with a recurrence of the hamstring injury that has troubled him in recent weeks.
"For this game we have a bit of a concern over Hatem and whether he will be available and that is something we are looking at today," said Pardew. "His hamstring has a little bit of a problem and we're still trying to get to the bottom of that."
Newcastle's form this season has also been a worry for Pardew.
They are 14th in the overall standings and have only won once in their last nine games in all competitions, a 3-0 home league victory over strugglers Wigan earlier this month.
With the January transfer window drawing ever closer, the Magpies boss is targeting one or two more creative players to inject his side with more flair and attacking threat.
"On our side we look weak with the injuries we have sustained and we may need to bring in a player or two," Pardew said.
"We are in the market, as I'm sure a few other clubs will be. We play QPR next week and I'm sure they will be busy.
"There will be some movement and for all Premier League clubs, stability this year is important as the finance does obviously increase so I think there will be movement in this window."