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"I just twisted my knee against Newcastle on Wednesday night, I think,' Richards told Spurs' official website.
"I can't remember the exact incident in which I did it either as it was fine after the game. "I sat down when I got home and when I got up it was a bit sore.
"During the night it swelled up a bit and was quite painful on Thursday and there is just a little bit of swelling left on it now. "It should be fine for the weekend. Hopefully I should be back training by Wednesday and by okay for Saturday."