Erik Lamela has been suffering with a hip injury for almost three months

Tottenham manager Mauricio Pochettino admits he and the club are beginning to worry about Erik Lamela's hip injury.

The Argentinian has not played for Spurs since the EFL Cup defeat to Liverpool in October and was recently allowed to return to former club Roma to see his old physiotherapist in a bid to get to the root of the problem.

But the injury has not improved and Pochettino confirmed on Thursday, ahead of his side's crucial clash with Manchester City, that Lamela will undergo another scan on Friday.

Lamela has not played for Tottenham since the EFL Cup defeat to Liverpool

Pochettino said: "Now we start to be concerned about him because he is three months and still in a situation that has not moved on.

"Tomorrow he will have a scan. Still it is difficult to give the time that he can come back. We need to wait tomorrow because there is still some problems, and we are still not sure of the diagnosis."

Lamela was allowed to return to Argentina for family reasons before Christmas and Pochettino said earlier this month that the 24-year-old had become anxious.

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The Spurs boss said: "First of all, the injury was nothing. Then, it was a little bit and then, it was that minor problem still, still, still, every day.

"Then, he had the problem with his brother. He went to Argentina. Stop. Then he came back and that affected a little bit his mind and now he was recovering very slowly. And it's for that, he is very anxious."