4. Jose Mourinho

Teams managed this decade - Inter Milan, Real Madrid, Chelsea, Manchester United, Tottenham Hotspur
Some call him football's greatest villain, some call him a tactical genius who is capable of the impossible - whatever your stance may be on Jose Mourinho, no one can deny the sheer genius and mastery of the Portuguese, who has established himself as one of the greatest managers of all time.
There is no one quite like Mourinho in the history of football. A dynamic personality who is a great leader of men, the former Porto manager is the ultimate pragmatic entity in the beautiful sport. Mourinho's end goal has always been the same - to win the game. How he goes about achieving it, that is entirely something else. You may not like his arrogance, his habit of picking fights with fellow managers, or his tactics which often seem negative; however, no one can deny that the man is pure box office entertainment, and he knows how to win.
This decade, Mourinho started by completing the treble with Inter Milan. He left for Real Madrid afterwards and led them back to the Champions League semi-finals while reclaiming the La Liga title from Barcelona. Mourinho's Madrid set several records in the 2011-12 season - most games won in a La Liga season (32), most away wins (16), most points obtained in any of the top European leagues (100), improving the most goals scored record they already had set earlier (121) and finishing the season with the highest goal difference (+89). The Los Blancos topped the league nine points clear of runners-up Barcelona.
A return to Chelsea beckoned in 2013, and he recaptured the Premier League title with the Blues in the 2014-15 season. After a disastrous start to the next season, the former Porto coach was fired and he joined Manchester United for the 2016-17 season. His spell at Old Trafford was not the best, but he did manage to win the Europa League and the EFL Cup with the Red Devils before being shown the door.
Currently, the Portuguese is managing Tottenham Hotspur as he hopes to lead them to the end of long trophy drought. Known for his defensive football but equally adept at counter-attacking and demolishing any sort of opponent, football in the 21st century would just not have been as much fun without Mourinho.
He has conquered several leagues, and it would be foolish to think that his time at the top is over. It is always fun to watch Mourinho in action, and we hope he stays at the top of his game for a long time to come.