Tottenham Hotspur fear Rafael van der Vaart could be sidelined for a month after suffering a hamstring injury against Liverpool.
Van der Vaart lasted just 12 minutes of Sunday's 2-1 win at White Hart Lane before being replaced by Jermain Defoe.
The Dutchman has been hampered by injury niggles since his move to Spurs from Real Madrid and Harry Redknapp believes the World Cup may have had an impact on the playmaker's fitness.
Redknapp also lost Younes Kaboul to a hip injury against Liverpool and is waiting for confirmation on how long the two players will be out.
"Rafa felt it tear, so that doesn't look too good," said Redknapp.
"Younes felt he might have torn a muscle in his hip. He felt that go.
"It's so disappointing for Rafa. He keeps picking up little injuries.
"It's probably because he's missed a pre-season or was away at the World Cup and not played many games.
"When your fitness is a bit low it's hard to get up to speed. He keeps getting little nicks."