Ljungberg suffered a hamstring injury during the first half of
the defeat against Arsenal on New Years Day.
The Swedish international is now facing a spell on the sidelines and manager Alan Curbishley
said: "It is unprecedented the situation we find ourselves in, but we have to regroup and get on with it. That is what is
happening to us at the moment- one goes in and one goes out."
"The biggest problem is they are getting fit during Premier League games and it is really
difficult to do that."
"We will have to see what the next couple of weeks bring and if it gets really acute,
we will have to start thinking about it."
Curbishley lamented his side's poor defending in their 2-0 defeat by Arsenal and felt it was
a "game too far" following their heroics against Manchester United.
He said: "You cannot come her (the Emirates) and go 1-0 down after 90 seconds. It was an uphill
task from then and both sides probably ran out of legs in the end. It was a very tired effort."
"The Manchester United game took a lot out of us as well. It was probably one game too many
for us over the Christmas period."
Meanwhile, the Hammers have sold 19-year-old Hogan Ephraim to Championship side Queens Park
Rangers for an undisclosed fee.