Every top team across Europe has a select group of players that they struggle to function without.
If you look at the success of Liverpool in 2018/19, a lot that was down to the spine of Alisson Becker, Virgil van Dijk and Mohamed Salah.
That trio were allowed to play near enough every key game for the club and it paid dividends for Jurgen Klopp.
The same goes for Barcelona, although they're more reliant one man, Lionel Messi, than a trio.
All of the elite have their 'Mr. Indispensables' and ESPN have given their opinion on which player is the most important for each of Europe's top 12 teams.
- Chelsea & Arsenal will take less than 6000 fans to Baku
- Crazy new goalkeeper sin-bin rule for Non-League
- All of Lionel Messi's 36 La Liga goals in 18/19
No surprise to see Messi for Barcelona and Van Dijk for Liverpool, but some other selections will certainly spark debate.
THE NOMINATED DOZEN
Barcelona - Lionel Messi
Liverpool - Virgil van Dijk
Manchester City - Fernandinho
Juventus - Joao Cancelo
Real Madrid - Casemiro
Manchester United - Paul Pogba
Tottenham - Christian Eriksen
Atletico Madrid - Jan Oblak
Chelsea - Eden Hazard
Paris Saint-Germain - Kylian Mbappe
Arsenal - Aaron Ramsey
Bayern Munich - Thiago
The one selection that stands out is Cancelo, with Cristiano Ronaldo omitted from the list.
But Cancelo's impact has been impressive. In his 18 Serie A games, Juve won 14 and drew four and guess where he was during the 2-1 loss to Ajax? On the bench.
The rest of the nominations look pretty solid, although Los Blancos fans may not universally agree on Casemiro.
Sergio Ramos, Karim Benzema or Dani Carvajal could perhaps have been included instead.
Ramsey featuring for Arsenal is pretty sad, with the Welshman leaving the club for Juventus this summer.
However, at least the Gunners have both Alexandre Lacazette and Pierre-Emerick Aubameyang to help fill the 'Mr. Indispensable' void left by Ramsey.
Do you agree with the selections given? Let us know your opinion by commenting below.