Messi sealed his hat trick and confirmed Barcelona's rout with goals in the 77th and 87th minutes.
However absurd it sounds, Lionel Messi still has an area of his game he needs to improve.
"Messi makes the extraordinary routine", said Barca coach Ernesto Valverde, whose side had Samuel Umtiti sent off late on.
"It was hard to make the first goal, in the second half we started well, dominating the game, but at 1-0 there was danger, with the second goal we were calmer". It was a magisterial free-kick, and he never tires of scoring hat-tricks. "We're seeing something unique, something that hasn't been seen in many years". As a player in La Liga, I don't remember anyone like him.
The Argentine pierced a hole in the stubborn Dutch champions with an exquisitely struck free kick in the first half, then produced two ruthless finishes from inside the area late on to complete a record eighth treble in Europe's top competition.
Mark van Bommel knew his side would not be capable of outplaying the perennial passing machine that is Barcelona, but his side were extremely effective in playing to their strengths despite the heavy scoreline, with the Dutchman utilising the sheer pace and precision of Bergwijn and Hirving Lozano - who's name rose to prominence during the World Cup for his attacking potency and victor against Germany.
But fuelled by Messi's brilliance, they have already laid down a marker.
"What a left foot he has", Rakitic told reporters.
"I would like to be much more effective on penalty kicks". Maybe this result is what will get them going. This was followed by Ousmane Dembele's curling strike in the 75th minute to add to his side's goal tally. The 23-year-old has only pushed on at the start of the season, with six goals and an assist in 8 games for PSV Eindhoven thus far this season.
"Dembele is doing well and is scoring important goals but that comes from hard work", Valverde said.