A penalty at the end of each half – the first converted by Gareth Bale, the second by sub Dele Alli – looked set to give Spurs an undeserved win but Mamoudou Karamoko scored a stunning stoppage-time equaliser.
Bale had cancelled out Peter Michorl’s long-range strike before Heung-min Son put Spurs in front. Johannes Eggestein pulled LASK level again before Alli and Karamoko’s late goals.
Spurs must now beat Royal Antwerp next week to finish top of Group J and, in turn, potentially an easier last-32 tie.
Here’s how Dan Kilpatrick rated those on show in Austria…
Joe Hart 4
Kept Spurs in the game with some solid saves in the first half but was beaten too easily for the first two goals.
Matt Doherty 5
Lost the ball in the build up the LASK goal with a slip and looked off the pace. Comfortably behind Serge Aurier in the pecking order as it stands.
Japhet Tanganga 5
Tried to inject some urgency into Tottenham by bringing the ball out of defence in the first half, as he attempts to prove to Mourinho he can play centre-half at the highest level.
Davinson Sanchez 4
Lost confidence and looks shaky, particularly at passing out from the back and dealing with crosses with his feet. Stepped out of defence recklessly for LASK’s second goal.
Ben Davies 5
The captain for the night was poor in possession and failed to offer any real thrust from left-back. Beaten too easily in build-up to the third goal.
Pierre-Emile Hojbjerg 5
Poor by his own high standards and failed to offer protection to the back four.
Giovani Lo Celso 6
Lacking the sharpness and energy of last season but no shortage of effort, including a lung-busting counter-attack in the first half.
Tanguy Ndombele 7
Lovely assist for Son’s goal and generally looked to make things happen. Won the penalty by firing against a defender’s arm.
Gareth Bale 7
Dispatched the penalty for his 200th career goal and showed the odd glimpse. Also demonstrated his rustiness his messing up a two-on-one with a pass behind Son.
Heung-min Son 7
Cool finish for the second goal but otherwise short of service. Subbed to save him for Arsenal.
Lucas Moura 6
Frequently gave the ball away in the first half but did play his part in the first goal with a cross for Ndombele.
Steven Bergwijn (Ndombele 65’) 7
Showed great strength to win the late penalty.
Moussa Sissoko (Lucas 65’) 6
Added energy to the midfield. Generally, it was a good night for him, with Hojbjerg, Lo Celso and Ndombele failing to impress as a three.
Eric Dier (Lo Celso 71’) 5
Came on to form a back three as Spurs looked to see out the match but offered little in the way of security.
Dele Alli (Son 82’) 7
Cute dinked penalty which nearly proved the winning goal.
Serge Aurier (Bale 82’) 5
Late cameo to save Bale’s legs and got forward a couple of times. Will be needed in the north London derby
Subs not used: Austin, Whiteman, Winks, Clarke, White, Scarlett