Chris Hughton hailed the performance of Mark Bunn as the Norwich stand-in goalkeeper saved a late penalty to help defeat Tottenham and set up a Capital One Cup grudge match with Paul Lambert's Aston Villa.
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Bunn, making just his second start of the season, pulled off a number of crucial saves throughout the shock 2-1 win, but he saved his most important one for two minutes from time.
Having over-turned a one-goal deficit, Norwich stood on the brink of last eight, but their victory was put in doubt two minutes from time when Kyle Walker went down under the challenge of Marc Tierney and referee Jon Moss pointed to the spot.
Bunn dived low to his left to deny Clint Dempsey from 12 yards, however, and ensure Norwich's passage to the last eight for the first time in 17 years.
"I thought he was excellent," Norwich boss Hughton said. "He is a really good goalkeeper. I can't imagine he was at fault with Tottenham's goal because it was a wonderful strike from Gareth Bale.
"Overall he showed good composure and he had good hands. The save for the penalty was fantastic. He was brave."
There seemed to be minimal contact between Tierney's out-stretched foot and Walker when the England right-back went to ground in the box.
"I thought (Walker) certainly made a meal of it," Hughton said.
"Marc Tierney said he didn't touch him. On the angle I have seen you can't tell if there is any (contact)."
Bale gave Spurs a deserved lead after 65 minutes when he drove home his second in two games from 20 yards.
Hughton, who spent a combined total of 24 years on Spurs' playing and coaching staff, then master-minded a turnaround by introducing Tettey, Grant Holt and Simeon Jackson.
Jan Vertonghen deflected Tettey's wayward shot in to his own goal within 15 minutes of the Norwich midfielder's introduction.
Then three minutes later Holt's header fell in to the path of Jackson after Hugo Lloris spilled the ball and the forward made no mistake from close range.
Both goals had a hint of fortune about them, but Hughton did not care.
"The first takes a deflection, but we haven't had one like that this season, or a penalty go in our favour," Hughton added.
"Sometimes you need luck but you have to force the issue as well. It's immaterial whether we deserved to win.
"It's a nice feeling to win. Spurs are a fantastic team that will have a good season so to beat a team of their quality is a real nice feeling."
It later emerged that Norwich will face Villa, whose manager Lambert had an acrimonious split from the Norfolk club this summer, in the last eight.
While the Capital One Cup is not top of Andre Villas-Boas' list of priorities, he will have seen this as a good opportunity to make his first trip to Wembley with Spurs.
Instead, he was left to reflect on yet another game in which Tottenham's defence crumbled in the dying minutes under pressure.
"It is obviously something that is in our mind at the moment," Villas-Boas said.
"It is obviously difficult but the further you train these situations sometimes the worst it becomes.
"You cannot match the emotion and concentration players face during the game.
"We obviously have to do better and try to improve things for the next game.
"It's a pity to see the game slip from our hands. We had a good performance."
Lloris was one of seven changes Villas-Boas made to the XI that returned to winning ways at Southampton last weekend.
The Frenchman performed well throughout until he dropped Holt's header just before Jackson lashed home.
Villas-Boas refused to criticise the France goalkeeper.
"He did extremely well in the game. He had a good solid performance," the Portuguese said.
"It is difficult for goalkeepers in situations like these."