Harry Redknapp admitted his Tottenham side struggled to deal with the Norwich strikers as their stuttering form continued.
Spurs have now won just two of their last 10 games and are now just one position above fifth-placed Newcastle who drew level on points after beating Bolton.
Jermain Defoe's confident finish cancelled out Anthony Pilkington's opener but Elliott Bennett scored a memorable winner for Norwich after the interval.
Despite suffering another setback in the race to qualify for the UEFA Champions League, Redknapp still praised the visiting team.
"Norwich played really well, they came here today and they were excellent, they really got after us," he told Sky Sports.
"They played balls forward to the front people and I felt they were always a threat and I felt we struggled to deal with them.
"I changed one or two things around. We had a couple of injuries. Scott Parker was not fit so he couldn't play."
Spurs have been highly praised for their attacking style this term and Redknapp adopted a more bold approach than in recent games, but it failed to reap dividends.
He added: "I felt that we would go 4-4-2 today and on paper it looks a real exciting, attacking team.
"Louis Saha had a bit of a groin injury, so I brought Emmanuel Adebayor on to play with Jermain Defoe, with Bale wide and Lennon wide.
"But to be fair, I felt we looked too open in midfield. People keep going on about playing 4-4-2, but it's alright if you play a tight 4-4-2 and you get back tight when people lose the ball.
"When we play a 4-4-2, we are really open because we have people that want to play and go forward, and I think it was a problem for us today."