Argentina's Juan Imhoff said his try which sent Racing 92 into the European Champions Cup final with a 19-15 win over title holders Saracens on Saturday was "extraordinary".
Winger Imhoff crossed with five minutes to play after a Finn Russell chip and centre Virimi Vakatawa's pass against Sarries who will be relegated from the English Premiership for breaching the league's salary cap.
The Parisians will travel to either Toulouse or Exeter Chiefs, who play later in England, on October 17 for a chance at a first European crown.
"We found it hard to break the defensive line. We won with something extraordinary which breaks the system," Imhoff said.
"It's now 80 minutes, anything can happen. We're where want to be," he added.
Sarries director of rugby Mark McCall praised Russell and Vakatawa's combination.
"They have this moment of magic in them. Finn Russell has a great relationship with the 13. I'm incredibly proud of this bunch to back up last week with a performance," McCall said.
A maximum of 1,000 spectators were allowed into the 32,000-capacity La Defense Arena under new coronavirus restrictions that came into effect earlier in the day.
France winger Teddy Thomas made his first appearance since February's Six Nations victory over Wales.
The visitors named an unchanged side from last weekend's success at Leinster as Alex Goode continued to deputise for England captain Owen Farrell who has been banned for a dangerous tackle.
Iribaren opened the scoring with an 11th minute penalty goal before Goode, who scored 19 points in Dublin, brought the sides level at 3-3 with his own effort after 25 minutes.
Neither side managed to claim the ascendancy in an error-strewn opening and Iribaren and Goode slotted two further penalties for a 6-6 scoreline with both efforts kicked in eerie silence.
The first glimpse of brilliance from Racing's international-filled backline came with two minutes of the first half to go as Scotland fly-half Finn Russell cleaned up a Sarries kick inside his own 22m.
He passed to Thomas out wide who ran free to chip ahead into open space and along with Imhoff forced full-back Elliot Daly to run the ball into touch.
Racing won a penalty after pressure from the resulting lineout and Iribaren claimed a 9-6 lead at the break.
Goode was successful with two further penalties inside the opening 10 minutes for a 12-9 advantage.
With half an hour remaining the hosts played a lineout quickly and Russell fed Simon Zebo on his 22m but the Ireland full-back knocked the ball on after a smothering tackle from Dominic Morris, a first-half substitute for Scotland centre Duncan Taylor.
Racing were pinned at the following scrum and Goode opened up a six-point gap.
Iribaren was replaced by 38-time France scrum-half Maxime Machenaud afterwards and despite pressure inside the Sarries half, the home side failed to find gaps in the disciplined away defence.
Machenaud closed the gap to 15-12 with a little over 10 minutes to play after Donnacha Ryan won a superb penalty at a ruck as Racing sensed victory and a place in the final.
But with five minutes to play they found the breakthrough as Sarries' defensive line faltered.
Vakatawa broke up field from a Russell chip to find Imhoff for the decisive try and Machenaud converted as Racing claimed a spot in the final, a third in the club's history after 2016 and 2018.