Teuma strike deflects off Goldson for first-half opener as Rangers struggle after positive start
Dominant hosts double lead with Vanzier penalty awarded after VAR check; McLaughlin with huge save to prevent third goal
Sides meet again at Ibrox next Tuesday
Winners of tie face Monaco or PSV Eindhoven in play-off round
FT: Union SG 2-0 Rangers
That'll do us this evening on a night to forget for Rangers.
Thanks for joining us. You can read our man Alasdair Lamont's full match report from the Den Dreef Stadium here.
We'll be back with live TV, radio and text coverage of Dundee United's Conference League first leg against AZ Alkmaar on Thursday.
Catch you all soon.
FT: Union SG 2-0 Rangers
More from Rangers boss Van Bronckhorst, who says his side "have to do so much better next week" if they are to make it past Union SG.
"In bigger stadiums against stronger teams, we never saw the performance we saw today. That's very disappointing at the moment.
"We're halfway, nothing is decided. We still have the chance to overcome it."
On the penalty decision: "It was a deflection from short distance. I don't know what we could do otherwise. Surely it wasn't an intentional handball. The penalty was not what I expected."
FT: Union SG 2-0 Rangers
Rangers boss Giovanni van Bronckhorst tells BBC Sportsound: "I'm very, very disappointed, especially as our performance wasn't at the level it normally is.
"You try to change personnel to change the game but overall we had too many below their usual performance, which makes it really hard to play as a unit.
"That was our biggest problem. That's the biggest thing that needs to change if we are to go through next week."
FT: Union SG 2-0 Rangers
Image source, SNSFT: Union SG 2-0 Rangers
Mark Hateley
Former Rangers striker for BBC Sportsound
Quote MessageYou could see a second goal coming all second half. Then you worry about the third goal. Colak, for me, was a waste of time. If Morelos is playing there, the ball goes into him. Colak didn't demand the ball.
FT: Union SG 2-0 Rangers
Rangers will look to get back on track when they welcome Kilmarnock to Ibrox on Saturday.
Then three days later it's the return leg against Union SG as Van Bronckhorst's men look to keep their Champions League hopes alive.
A huge week in the Ibrox side's season coming up even this early in the campaign.
FT: Union SG 2-0 Rangers
Mark Hateley
Former Rangers striker for BBC Sportsound
Quote MessageAt the end of the day, Rangers are very, very lucky to come away with a 2-0 defeat.
Image source, SNS
Image source, SNS
Image source, Getty ImagesFT: Union SG 2-0 Rangers
Richard Foster
Former Rangers defender on BBC Sportsound
Quote MessageThe worrying thing for me was there was an acceptance about it. The players weren't getting at each other. They never put in any tackles. There was no-one taking charge of the game. Rangers are more than capable of coming back in this tie, but they're going to need to do something.
FT: Union SG 2-0 Rangers
Almost a year ago the day, Rangers fell to a first-leg defeat in Malmo at this exact stage of Champions League qualifying.
Steven Gerrard's side weren't able to turn it around in the second leg at Ibrox, losing 4-2 on aggregate.
Will Van Bronckhorst be able to guide Rangers to a comeback a year on?
FT: Union SG 2-0 Rangers
Ex-Rangers right-back Alan Hutton on Premier Sports: "We could tell Van Bronckhorst wasn't happy. He tried to come out with a certain game-plan. Did it work, no? Overall, he will be really disappointed."
Former Ibrox striker Kenny Miller on Premier Sports: "The system stayed in place the whole match. Lundstram was ineffective in the centre-back role tonight. It was a real down performance in contrast to what we expect."
FT: Union SG 2-0 Rangers
Image source, Getty ImagesRangers fail to clear their lines and Teddy Teuma lashes in the opener
Image source, Getty ImagesThe Union captain celebrates wildly with his fans
Image source, SNSAfter a lengthy VAR check, the hosts are awarded a penalty for a harsh handball on Connor Goldson
Image source, SNSDante Vanzeir sends Jon McLaughlin the wrong way to make it two
FT: Union SG 2-0 Rangers
Ex-Rangers striker Kenny Miller, on Premier Sports, calls the penalty decision for the second goal "a farce".
"It's a ridiculous decision," he adds.
FT: Union SG 2-0 Rangers
Mark Hateley
Former Rangers striker for BBC Sportsound
Quote MessageIt was a poor, poor show. Weak and blunt. We don't even know if Union's back three are any good. Is the goalkeeper any good? We don't know. Union figured Rangers out after 25 minutes.
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A sobering night for Rangers.
Giovanni van Bronckhorst's men will have to turn around a two-goal deficit next week to keep their Champions League hopes alive.
Could've been worse in all honesty.
Union SG 2-0 Rangers
But it's Union who are threatening again as James Tavernier needs to clear a ball of the line!
Wow... that could be a huge moment in the tie.
Union SG 2-0 Rangers
Four minutes added for Rangers to try find something...
Union SG 2-0 Rangers
Ridvan Yilmaz has a dangerous shot blocked before Ben Davies' cross is collected well by home keeper Moris, who now needs treatment.
Union SG 2-0 Rangers
Judging by the way this game is going, Rangers would maybe settle for 2-0 now.
They look like they could play all night and not find a way through. Plus their mistakes are being punished at the back.
Anything more than 2-0 might well take this tie out of reach.