Manchester United boss David Moyes has said he may struggle to strengthen his squad in January because there are not many suitable players available to sign in the mid-season transfer window.
He said a lack of new faces would "not be because we don't want to do it".
"We would like to bring people in but are those players available?" he said. "There is an urgency but there's no point in me hyping it up because the players we would like to bring in are probably not available in January."
Manchester United currently reside in 7th in the Premier League, and were knocked out of the FA Cup by Swansea at Old Trafford on Sunday for only the second time in 30 years.
Moyes admitted there was less of a fear factor at Old Trafford this season after his side's fourth loss in six home matches. Wilfried Bony's 90th-minute winner earned Swansea their first win at Old Trafford after Javier Hernandez had cancelled out Wayne Routledge's early goal.
The hosts had extra problems after Fabio received a straight red 10 minutes from the end after he had replaced Rio Ferdinand, who suffered a knee injury in his first game since 10 December.
The defeat, United's seventh of the season in all competitions, came after they were beaten 2-1 by Tottenham at Old Trafford on New Year's Day.
"Of course we need to return to winning ways," the Scot said. "We need to try and get ourselves to be hard to play against and get something out of the good play we have in games."
Manchester United midfielder Darren Fletcher said the team "had let Moyes and the fans down." He added, "It's a massive blow, let's not kid ourselves here, this is a really bad result and there are a lot of angry, hurt players."
"It's not good enough and we're going to have to raise our performance levels. We have another big game in 48 hours so we have to keep that in mind, but there is no excuse really, we had a very strong team," added Moyes.
"Just about every player on the pitch was an international player. We shouldn't [rely on Rooney and Van Persie]. It should be that we put out a really strong team, everybody gets their opportunity to show what they can do, and then I make decisions from that."
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