Vertonghen looks like he will have to remain out of position for the time being.
"I have had lots of conversations with Jan regarding this situation," Villas-Boas said. "Unfortunately he has to sacrifice his position as centre-back for the team.
"His position at centre-back is not in question. He is one of the greatest central defenders I have worked with. He knows that and he knows that position is waiting for him whenever we have options at left-back.
"He has my word.
"He hasn't fallen in love (with playing at left-back).
"I know he doesn't like it, but it's no big deal. It's a decision I have to make for the best of the team."
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