Update: Now Manchester United have also posted that Cristiano Ronaldo is back in a long-sleeve shirt. CR7 was not the only United player to wear long sleeves - Raphael Varane also wore a long-sleeve kit, with an undershirt below it. Thanks to @rt27luuuv.
Meanwhile, the authentic version of the Manchester United kit with long sleeves is still not available to buy.
Update: Adidas seem to have met the demand of Cristiano Ronaldo - the Portuguese superstar debuted an exclusive long-sleeve version of the Manchester United 21-22 home kit against Villarreal.
CR7 Debuts Long-Sleeve Man United Kit As The Only Player
Other Man United players such as Sancho and McTominay wore undershirts.
Until September 25: Cristiano Ronaldo Wears Undershirt Instead Of Long-Sleeve Kit For Manchester United
Update: For the second half, Cristiano Ronaldo ditched the undershirt and just wore a short-sleeve shirt.
Cristiano Ronaldo is wearing a different shirt style for Manchester United than he does for Portugal.
Instead of the traditional long-sleeve, he wore in the Euro 2020, Cristiano Ronaldo wore an undershirt in his first two matches with Manchester United.
For Real Madrid, Adidas created custom long-sleeve Player Issue kits
In the Euro 2020, CR7 wore a traditional long-sleeve football kit that has been created by Nike for their best players.
Why does CR7 not wear a long-sleeve kit for Manchester United?
We think the reason is that Adidas does not offer a long-sleeve Player Issue version of the United 2021-2022 kits.
For Real Madrid, Adidas created custom long-sleeve Player Issue kits. which were also worn by Ronaldo. For Juventus, Adidas did not provide CR7 with a custom long-sleeve jersey - he used an undershirt.
All Manchester United players wear short-sleeve shirts - some with undershirts
Cristiano Ronaldo had a successful comeback at Manchester United wearing an undershirt, scoring three goals in the first two matches. Man United, meanwhile, lost the match against Young Boys 1-2.
Should Adidas offer Cristiano Ronaldo a long-sleeve version of the Manchester United 2021-22 authentic kit? Comment below.