The Spurs centre-half stated that he felt that the French side did not put the visitors under too much pressure.
Erik Lamela’s first-half strike in the Principality put the English side in the ascendancy and Mauricio Pochettino’s men had chances to wrap up the game but did not take them.
Monaco rallied and a second-half strike meant that the spoils were shared in a 1-1 draw and by the end it looked like the Ligue 1 outfit, rather than Tottenham, could win the game.
Vertonghen has stated that he felt that Spurs were relatively comfortable against Leonardo Jardim’s men and that the fact that the hosts got an equaliser was something of a surprise.
“On the pitch we didn’t have the feeling that we we’re going to concede,” he told the club’s official website.
“We felt quite solid at the back and we didn’t give too many chances away so for us it feels a bit like a defeat. But in the last ten minutes Monaco was looking for the winner, not us.
“Sometimes you are waiting to concede a goal but we didn’t feel like that today. We felt confident at the back and were defending well. It came as a surprise that they scored.”
Spurs will now return to domestic action this Sunday as they travel to face a dangerous Swansea City side at the Liberty Stadium.
The North London outfit have won their last three Premier League games and sit in sixth place currently, with Pochettino sure to want his side to continue to build momentum after the dramatic 4-1 hammering of Manchester City last weekend.