Thomas Tuchel has come up with a clever ‘secret’ trick to fool the opponents of Chelsea.

The German tells players to use code words when they attack, so that his men know where to run when they are going forward — and who to aim for.

It is a system that includes a group of these key ‘triggers’ to let Blues stars know what side they will go down, whether the ball is put in high or low and even if it is long or short.

It seems to be paying off with Chelsea unbeaten in 12 matches since his arrival.

The Blues were well below their best yesterday but still managed to claim a 0-0 draw at Leeds.