The north London side, who earned a 1-1 draw against Norwich on Wednesday evening, have added Lewis Holtby and Ezekiel Fryers to their squad so far this month but have been linked with a host of further names.
And the Portuguese hinted that Spurs are still exploring their options before the close of the window, though he did concede that arrivals are "unlikely"
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"It’s not impossible that a couple of things can happen, but it’s highly unlikely. I think we need to add quality to the squad."
On the prospect of beating Arsenal to Barcelona striker Villa, he added: "No I don't think so. It's completely unreal at the moment."
Tom Huddlestone has been linked with a move to Tottenham's London rivals Fulham, but the Portuguese boss expressed doubt over the possibility of a switch materialising.
He added: "There was an interest from Fulham. I’m not sure if they’re going to follow that interest on. We have allowed the club to speak to the player.
"He’s a player that we rate very, very highly and I think it’s very unlikely it can happen."