United will not play in this year's Champions League with some hurdles in the Europa League.
It was announced that Casemiro will take on No. 18 formerly won by Man Utd legend Paul Scholes on Friday.
The pairing done on Friday saw them in Group E with Real Sociedad, Sheriff and Omonoia.
When Casemiro was asked about not playing the Champions League, the former Real Madrid man said, "Well.. I already have five, don't I?".
Casemiro had won the Europe's elite competition 5-times that is even more than United entire Champions League Trophy.
But his comment was not at the club, rather it was to calm fans' mind about playing in the second-tier of European competition.
Casemiro was an important part to all of Madrid's European wins, although he did miss the 2014 final.
He started all the other finals alongside Luka Modric and Toni Kroos, and even scored one against Juventus in 2017's 4-1 trouncing.
Casemiro was paraded around Old Trafford before the Red Devils stunned Liverpool.
Jadon Sancho and Marcus Rashford did the damage as Erik ten Hag got his first win as United boss - and arrested the club's worrying early-season form.
The Dutch manager will be hoping Casemiro can help beef up a midfield that was found wanting in losses against Brighton and Brentford.
He may not be the last man into Old Trafford either with moves for Ajax rebel Antony believed to be in the making.