Update: With Griezmann and many other top players wearing long-sleeve jerseys, many people asked why they do so. In the case of Griezmann, it is because of Beckham (just as his shirt number 7 - he already revealed it in 2016). Some of the others like Havertz could have been inspired by Griezmann.
Griezmann wears them because of Beckham, Havertz possibly because of Griezmann
In fact, the German football federation (DFB) said that Kai Havertz and Leroy Sané "both would decide this (long-sleeved jersey) on a whim and that it was a personal preference". France's Antoine Griezmann "would also play with long-sleeved jerseys".
CR7 returned to short sleeves for the second half against Germany
Interestingly, Cristiano Ronaldo only wore a long-sleeve jersey in the first half against Germany, while he reverted to a short-sleeve jersey for the second half.
All teams have played their first match of the UEFA Euro 2020. One of the things that kit aficionados such as Classic Football Shirts (thanks for pictures), Kit Crimes and Phil Delves liked the most was the "return" of long-sleeve jerseys.
Players Wear Long-Sleeve Kits In Euro 2020
In the first round of the UEFA Euro 2020, several of the world's best players wore traditional long-sleeve kits, including CR7 and Mbappé.
Mbappé wore the long-sleeve shirt in the second half only
Interestingly, as spotted by Classic Football Shirts, Kylian Mbappé wore the long-sleeve shirt only in the second half against Germany.
Most players still seem to prefer undershirts, but it is remarkable that especially the top players wear traditional long-sleeve kits.
Adidas, Nike and puma do not sell long-sleeve national team kits
What is bad is that Adidas, Nike and Puma are not selling long-sleeve versions of the 2020-2021 national team jerseys.
A picture of Griezmann perfectly illustrates how the VaporKnit long sleeves have been custom made for the players.
Messi is wearing undershirts
Álvaro Morata
Cristiano Ronaldo
Kai Havertz
Antoine Griezmann
Kylian Mbappé (second half only)
Ousmane Dembélé
Leroy Sané
Euro 2020 Kit Overview - All 24 Team's Kits
Have you spotted more players with long-sleeve kits? Do you think brands will start to sell long-sleeve kits again soon? Share your thoughts in the comments below.