David Luiz and Diego Costa are the two most mischievous people in the Chelsea dressing room, and when it comes to mischief and pranks, they both score high.

Costa and Luiz were in good spirits when they both teamed up to take one unsuspecting man – who we can’t identify from the Sky Sports shots – by surprise.

It’s unclear who it is but Luiz and Costa sneak up and pull his hood over his head.

This happened after Diego Costa tried to put a Chelsea staff in a cardboard box, and an eyewitness on ground revealed it was all jokes.

Photo: Sky Sports

Photo: Sky Sports

Photo: Sky Sports

According to the Daily Express, a source who witnessed the incident said: “It was all in good spirits and nothing more than a playground fight!

“Diego Costa is always a livewire around the training ground and he’s always cracking the jokes.”