The Jose Mourinho method Thomas Tuchel is following with his Callum Hudson-Odoi decision

Chelsea boss Thomas Tuchel made a bold decision to substitute Callum Hudson-Odoi during the club's draw against Southampton just half an hour after he had come off the bench

Thomas Tuchel made a big decision during Chelsea's draw against Southampton on Saturday afternoon, breaking an unwritten rule by bringing off a substitute in Callum Hudson-Odoi.

The choice to take off a substitute is never usually a positive decision; it's never good for a player to pick up an injury, but to substitute a player who started the game on the bench is almost universally seen in the world of football as a manager's negative view on said player.

Whether it can be explained away through a tactical choice due to a change in game state, it's always a big sign of embarrassment for the player leaving the field of play.

Tuchel's move to bring Hudson-Odoi off the field less than 30 minutes after he had replaced Tammy Abraham at half-time was described as "bold", "brave" and "a big gamble" by former Chelsea star Joe Cole.

Cole believed it was a sign of Tuchel trying to lay down a marker with his team, stamping his authority among a Chelsea dressing room which the former Blues star said has historically been "fragmented".

However, he also stated it was a big risk, testing a young up-and-coming player's mentality ahead of the Champions League tie against Atletico Madrid on Tuesday.

Tuchel is not the first coach to bring off a player who came on as a substitute, and he'll likely not be the last.

Perhaps the most famous incident in recent times was that of Jose Mourinho, in his first official match in charge of Manchester United.

In the Community Shield clash against reigning Premier League champions Leicester City back in 2016, Mourinho elected to bring off Juan Mata heading into injury time, having only brought the former Chelsea star on 30 minutes before.

Mourinho attempted to rationalise the decision, stating that United were expecting Leicester to put some high balls into the box in the dying moments, and due to Mata's diminutive stature, he was the clear choice to come off the pitch.

But given he was replaced by another attacker in Henrikh Mkhitaryan (who is just three inches taller than 5ft 7ins Mata), it was a clear sign of a manager making a statement about his team.

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Mourinho spent two-and-a-half seasons at United, but his time at Old Trafford was strewn with questions over his relationship with certain players, whether it be criticism of them in the media or in person on the training ground, from Luke Shaw and Paul Pogba to Anthony Martial and Marcus Rashford.

By the time of Mourinho's exit from Manchester United, there were reports that the manager had alienated much of the first-team dressing room with antagonistic clashes hoping to pull the best from his side.

Tuchel has landed the first blow in a bid to establish his dominance over the Chelsea dressing room, but he must ensure that it is not too regular an occurrence, lest he could alienate the team.