The 24-year-old only made seven Premiership starts this season and was on the verge of signing for Manchester City at the end of the January transfer window only to agree to stay with Spurs and assess his options this summer.
In an interview with Al-Mehwar, an Egyptian television channel, he said: "The hard times started with me making the wrong decision. I made a big mistake when I signed permanently for Spurs. I know that this could result in problems but it is the truth."
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