Aston Villa manager Paul Lambert is awaiting specialists' reports amid fears that star striker Christian Benteke could be sidelined for several weeks.
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Lambert has had to rule the Belgium international out of Tuesday's Capital One Cup tie against Tottenham after he suffered an injury in the 1-0 win at Norwich.
Benteke, 22, has aggravated an existing hip problem and will see specialists after having undergone a scan.
He had to be substituted after falling awkwardly at Carrow Road, and Lambert had been hoping the problem would not be too serious, enabling him to return for the weekend fixture against Manchester City.
The manager said: "If you look at his injury, he has actually slipped at that moment when he challenged for the ball.
"I'm not a doctor. We will have to wait until the results come back and speak to the relevant people that we think are the best in that field.
"You are hoping it is going to be pretty quick but you don't know, and I have to wait and see when I get a call later to see what everybody's thinking."
Benteke, who has scored five goals this season, could potentially miss Belgium's final Group A World Cup qualifying games against Croatia and Wales.
The Belgians need a point to be certain of reaching Brazil next summer.