Tottenham assistant manager Kevin Bond is still confident his side will qualify for the Europa League last 32 despite losing 1-0 at Rubin Kazan.
A 55th-minute free-kick from Bebras Natcho made the difference as Spurs slipped to third place in Group A.
"We were under no illusion how good a side they were," said Bond.
"It's going to be tight right until the end, but with the games we have got left it's still in our hands to qualify and we feel confident we will do."
The Premier League club are now level with Rubin on seven points but have an inferior goal difference, while PAOK Salonika are a point clear in top spot.
Spurs host PAOK on 30 November before finishing against Shamrock Rovers at White Hart Lane on 15 December.
They were without boss Harry Redknapp, who did not travel to Russia after undergoing a procedure to unblock two coronary arteries on Wednesday.
Redknapp did, however, pick the team, with youngsters Andros Townsend, Ryan Fredericks and Tom Carroll starting alongside the likes of Steven Pienaar, Jermain Defoe and William Gallas.
But despite their superior experience and quality, Tottenham failed to find their rhythm throughout and could not even muster a shot on target.
At the other end, Cudicini made a string of superb saves, only to succumb to Natcho's brilliant set-piece.
The free-kick was awarded after Sebastien Bassong tried to dribble out of his own box, losing control of the ball and fouling Alexander Ryazantsev.
"What can I say? I told the lads: 'Sorry, I should have cleared it. I'm sorry'," said the Cameroon defender.
"It's simple. I should have cleared the ball and I took an extra touch, an extra bad touch. I didn't see him coming and when I found out it was too late because I had a bad touch.
"I was praying it wouldn't be a goal but it was."