#3 Diego Simeone
Chelsea are well-known for their defensive solidity, immense physicality and sharp counter-attacking play. Perhaps the best manager whose system ticks all these boxes is Atletico Madrid's Diego Simeone.
The Argentine has been one of the standout tacticians in Europe over the last few years. His team has proven to be an able match for even the most rampant attacking clubs on the continent, producing solid performances.
In Simeone, they would not only have a decent replacement if Tuchel leaves but also one of the best managers in the world.
#2 Zinedine Zidane
Zinedine Zidane took centre stage in spectacular fashion, leading Real Madrid to one of their most successful eras between 2016 and 2018. He led them to an unprecedented three consecutive UEFA Champions League titles; no other club has won consecutive titles in the competition in the UCL era.
The Frenchman parted ways with Real Madrid after his second spell with the club, which expired at the end of last season. Zidane has been without a job since leaving the Santiago Bernabeu but could make a return to the sidelines shortly.
The 49-year-old is reportedly (Football Espana) on the radar of Manchester United and Paris Saint-Germain (PSG). Chelsea could also make a swoop for him if they lose Thomas Tuchel in the coming months.
#1 Luis Enrique
Former Barcelona manager Luis Enrique is another top-class tactician who could replace Thomas Tuchel at Chelsea. In fact, the Spaniard has been on the radar (Bleacher Report) of the Blues for quite some time, so it wouldn't be a surprise if makes a switch to Stamford Bridge anytime soon.
Enrique is currently managing the Spanish national team, with whom he has been working wonders in the last couple of months. He's helped secure La Roja's qualification for the FIFA World Cup this year, winning his last three games in charge of the team.
In addition to his eye-catching exploits at international level, the Spaniard has also enjoyed a successful spell in club football with Barcelona. He has one UEFA Champions League, two La Liga, three Spanish Cups, among others, in his trophy cabinet.