[ad_pod ]Chelsea's preparations for the Europa League Final have been far from ideal.Injuries to crucial players such as Antonio Rudiger and Ruben Loftus-Cheek, as well as the fact N'Golo Kante is a doubt, have given Maurizio Sarri a massive selection headache in what could be his last game as Chelsea manager.And his stress levels appeared to reach boiling point last night as he stormed off from a Chelsea training session just moments after David Luiz and Gonzalo Higuain clashed.Chelsea have stated that the reason for Sarri's walkout was because he was not allowed to practice set-pieces as the session remained open to the media.

As the above video shows, there was an altercation involving Higuain and Luiz after the Argentine appeared to go in late on the Brazilian defender. Luiz reacted angrily and refused an apology from the former Juventus man.

The official club statement says the two incidents were not related but Sarri has shown his rage before when his players have not listened to his instructions, so it seems unlikely that the official word matched what went on in reality.

What is certain, however, is that this is just another distraction which will only hinder Chelsea's bid to win the Europa League.