It's a tough gig being a football manager at the very highest level of the professional game.
The money may be fantastic, but there's no denying that it's an incredibly stressful job, one in which the threat of being sacked is constantly looming overhead.
There's no magic formula to succeeding in the managerial game either. It requires unwavering commitment, intelligence and creative thinking towards the sport as a whole.
Of course, it helps when a manager is also able to acquire the correct players through the transfer market.
That's why the likes of Pep Guardiola, Jose Mourinho and Carlo Ancelotti have enjoyed so much success, as they've been afforded the luxury of being able to spend a serious amount of money at various clubs.
The trio have all splashed over £1 billion on players throughout the course of their careers, with Mourinho at the top of the pile in that regard on £1.54 billion.
MILAN, ITALY - APRIL 23: AS Roma head coach Jose Mourinho looks on prior to the Serie A match between FC Internazionale and AS Roma at Stadio Giuseppe Meazza on April 23, 2022 in Milan, Italy. (Photo by Marco Luzzani/Getty Images)
But what about when it comes to the money managers have made from player sales?
Well, Guardiola, Mourinho and Ancelotti all feature in football history's top 20 there as well, although neither of them take top spot.
Let's take a look at where they rank...
MADRID, SPAIN - MAY 04: Carlo Ancelotti, Head Coach of Real Madrid shakes hands with Pep Guardiola, Manager of Manchester City prior to the UEFA Champions League Semi Final Leg Two match between Real Madrid and Manchester City at Estadio Santiago Bernabeu on May 04, 2022 in Madrid, Spain. (Photo by David Ramos/Getty Images)
The 20 managers who've made the most money from player sales in football history
20. Maurizio Sarri (66 players sold) - £463.14 million
19. Mircea Lucescu (76 players sold) - £475.35 million
18. Peter Bosz (36 players sold) - £481.97 million
17. Roberto Mancini (99 players sold) - £482.88 million
16. Jurgen Klopp (103 players sold) - £514.30 million
WOLVERHAMPTON, ENGLAND - JANUARY 23: Liverpool manager Jurgen Klopp celebrates after the Premier League match between Wolverhampton Wanderers and Liverpool FC at Molineux on January 23, 2020 in Wolverhampton, United Kingdom. (Photo by Michael Regan/Getty Images)
15. Thomas Tuchel (72 players sold) - £516.06 million
14. Antonio Conte (88 players sold) - £531.32 million
13. Ernesto Valverde (46 players sold) - £536.86 million
12. Unai Emery (78 players sold) - £543.69 million
11. Gian Piero Gasperini (129 players sold) - £570.79 million
BERGAMO, ITALY - SEPTEMBER 02: Atalanta BC coach Gian Piero Gasperini looks on before the serie A match between Atalanta BC and Cagliari at Stadio Atleti Azzurri d'Italia on September 2, 2018 in Bergamo, Italy. (Photo by Emilio Andreoli/Getty Images)
10. Ronald Koeman (64 players sold) - £604.25 million
9. Arsene Wenger (113 players sold) - £613.76 million
8. Rafael Benitez (107 players sold) - £637.68 million
7. Pep Guardiola (75 players sold) - £640.75 million
6. Jorge Jesus (121 players sold) - £651.21 million
LISBON, PORTUGAL - SEPTEMBER 29: Head coach Jorge Jesus of SL Benfica reacts during the UEFA Champions League group E match between SL Benfica and FC Barcelona at Estadio da Luz on September 29, 2021 in Lisbon, Portugal. (Photo by David Ramos/Getty Images)
5. Max Allegri (115 players sold) - £678.88 million
4. Jose Mourinho (100 players sold) - £713.03 million
3. Carlo Ancelotti (114 players sold) - £744.60 million
2. Leonardo Jardim (63 players sold) - £866.82 million
- Diego Simeone (85 players sold) - £913.38 million
LYON, FRANCE - MAY 16: Diego Simeone, Coach of Atletico Madrid celebrates his team's victory in the UEFA Europa League Final between Olympique de Marseille and Club Atletico de Madrid at Stade de Lyon on May 16, 2018 in Lyon, France. (Photo by Laurence Griffiths/Getty Images)
It's Simeone who takes top spot this time around.
The man who's turned Atletico Madrid into a bona fide superclub averages over £10 million per player sale, with the largest of the lot being Antoine Griezmann's £108 million move to Barcelona.
Simeone also oversaw Lucas Hernandez's £72 million switch to Bayern Munich.
After this summer's transfer window, the Argentine may become the first manager to reach £1 billion in player sales.