Even as the team struggles in the Premier League, Dele Alli and Carlos Vinicius ensured Tottenham can still save their season when they inspired a 4-0 rout of Austrian minnows Wolfsberger in the Round of 32, second leg on Wednesday.
Alli scored Tottenham's opener early in the first half and provided the assist when Vinicius doubled their lead after the break.
Gareth Bale netted from another Alli assist before Vinicius bagged his second as Tottenham ran out 8-1 aggregate winners after cruising to a 4-1 victory in the first leg last week.
While progress to the last 16 looked a formality after the comfortable first leg success, nothing has come easy for Tottenham this term.
After the win, Jose Mourinho will have breathed a sigh of relief that his team kept alive their best-remaining hope of qualifying for the Champions League.
A dismal run of six defeats in their last eight games in all competitions had seen Tottenham plunge to ninth place in the Premier League and crash out of the FA Cup.
Tottenham are languishing nine points behind fourth-placed West Ham in the race for a top-four finish, while Mourinho is mired in the worst run of his career.
Well aware that some media critics and Tottenham fans claim he is past his best, the prospect of a humiliating exit against unheralded Wolfsberger was unthinkable for Mourinho.
For once, his players didn't let him down.
Ironically, it was Alli -- frozen out by Mourinho for much of the season -- who played the key role.
He put Tottenham ahead after just 10 minutes in eye-catching style.
When a loose ball fell to him 15 yards out and with his back to goal, Alli sent a superb bicycle kick looping into the far corner.
Vinicius benefitted from Alli's excellence five minutes after half-time when the on-loan Benfica striker met the midfielder's precise cross with a clinical far post header.
Bale came off the bench to fire into the top corner after another Alli assist in the 73rd minute.
Ten minutes later, teenager Dane Scarlett stole possession and teed up Vinicius to score from 12 yards.
Amid reports that Tottenham's players are bored with his training sessions and conservative tactics, Mourinho this week insisted his methods are "second to none", claiming morale among his squad was still high.
But the former Chelsea and Real Madrid boss is likely to face the sack unless Tottenham can salvage their woeful campaign by reaching the Champions League.
Tottenham were regulars in the top four and reached the Champions League final under Mourinho's predecessor Mauricio Pochettino.
But Pochettino, now in charge at Paris Saint-Germain, was sacked by chairman Daniel Levy after a poor run of results last season and Mourinho could easily suffer the same fate.