Chelsea began the season extremely undersized on the squad front.
They had a transfer embargo which meant that the Blues could not sign any player. They were also under fire since their best player Eden Hazard had left. Frank Lampard, the new boss had come and was doing his best to work out the way.
He had done pretty well until December when things started falling apart thanks to injuries and bad form.
The Chelsea season has been plagued with injuries. Chelsea missed their senior centre back Antonio Rudiger for a majority of the season. Zouma, Tomori, Christensen has gone through injuries in bits and parts. James was missing the first part of the season. Kante has been injured no less than 4 times this season and is currently out.
Ruben Loftus-Cheek is not yet back from the injury he suffered last April. In attack, Tammy Abraham is clearly burned out and now injured. Callum Hudson-Odoi is out now and was out in the beginning of the season as well. New signing Christian Pulisic has missed close to two months via injury.
Whatever training is happening and the medical staff is doing, Chelsea need to keep a better check on their system.