Spurs have been strongly linked with a move for Real Madrid ace Fabio Coentrao. Spurs are short of options at left-back following an injury to Danny Rose.
Spurs centre-back Jan Vertonghen has been forced to provide cover at left-back in Rose’s absence.
When asked about signing a new left-back in January, Villas-Boas said: “No, I don’t think so.
“Danny Rose is still out but making good progress on his injury so we’re looking for a two or three-week period now finally for his return.”
He added on Vertonghen: “He is a central defender – one of the best in the world. Unfortunately, due to the situation at the moment, he has to sacrifice himself at left-back.
“He knows that as soon as Danny Rose comes back, the place as a centre-back is his again. The good of the team is more important at the moment.
“We understand he is making a sacrifice and that is why we respect him and have made him captain at times this season. But there is no problem.”