Champions League 2018-19: 4 reasons why Juventus lost to Atletico Madrid 

#1 Allegri's indecisiveness

Max Allegri was slow to react to the game

Massimiliano Allegri has been one of the most successful managers over the last few years, winning the double of Serie A and Coppa Italia consecutively for the last four seasons, while also guiding Juventus to the latter stages of the Champions League.

However, for all of his domestic dominance, there are still many who believe he has to taste success on the continent for him to truly prove his worth, as the Juve haven't triumphed in Europe's premier club competition for over two decades.

Coming up against Diego Simeone gave the 51-year-old a chance to pit his wits against one of the best coaches in the world, however, he came up painfully short.

Whereas his Argentine counterpart was quick to react to the game, making quick changes by replacing the misfiring Diego Costa with Alvaro Morata, while also taking off Thomas and Koka for Lemar and Correa respectively. Meanwhile, Allegri was much slower to enforce changes, until it was almost too late.

Simeone threw all three of his cards before the 67th minute and barely 5 minutes later, they got the ball in the back of the net which was ruled out for a controversial offside call, but they were duly rewarded when with 12 minutes left, Jose Maria Gimenez put them deservedly ahead.

By contrast, Allegri was much slower to effect the desired changes, leaving Paulo Dybala on until the 80th minute, when it was clear from the onset that this was not going to be the Juve number 10's night, while he also left it too late to haul off other underperforming players like Blaise Matuidi and Miralem Pjanic.

Tight fixtures like these are usually settled by tactical switches from the bench and whereas Simeone realized this on time, Allegri was much slower to do so which cost his team and left Juve with a big mountain to climb come March 12.