Chelsea striker Diego Costa may not be having too much fun on the pitch at the moment, but he's definitely having fun off of it. The Spaniard has failed to score in his last three games for the Blues, and if he doesn't net on Saturday against Bournemouth, it will be the first time he's failed to score in four consecutive Premier League games.  His dry spell on the pitch doesn't seem to have affected his actions off it, as he's been caught causing havoc at Chelsea's training ground in a behind the scenes video released this week.  He can be seen eyeing up a tractor after emerging from the dressing room, while his teammates take selfies with Willian's go pro camera.Costa is then filmed joyriding the tractor across the training pitch, attempting - and failing, to slalom through a set of cones before driving over them.  What's even funnier is that his teammates don't seem to be phased by the striker's behavior at all, as they continue to take selfies before training.   The video then cuts to Costa again, but this time he's on foot, smashing up a row of hurdles with one that's already been broken.The 28-year-old is then met with a chorus of boos from other Chelsea players as he raises a broken hurdle in triumph.   You may love him or hate him, but you can't argue that he's certainly one of the craziest characters in the game.   

As disciplined as Chelsea are on a matchday, it's good to see that they can have fun during the week. Antonio Conte seems to have struck a perfect balance between work and play, and it's paying off.    

The Blues are seven points clear at the top of the league after they came through a tough fixture on Wednesday, beating Manchester City 2-1 at Stamford Bridge.    

The leaders needed a result in that game after being beaten by Crystal Palace last Saturday. Tottenham, who are currently in second, were given hope when Chelsea dropped three points at the weekend.

  

However, Conte's team swiftly took that hope away with a midweek win, meaning they need just six more wins to be confirmed as champions.   

Do you think Chelsea will be caught at the top of the Premier League? Let us know your thoughts in the comments section below.