Looks pretty serious stuff:

ESPN senior writer Mark Ogden told BBC Radio 5 Live that the government sanctions imposed on Roman Abramovich could have serious ramifications for Chelsea.

“It’s multi-layered, it’s huge and it affects every little area of the club.

"They can’t sort out new contracts so they can’t negotiate a new contract with Antonio Rudiger who is one of their best players. He’s pretty certain to leave as a free agent.

"Once we see the fine print, it's cataclysmic for Chelsea. It’s unprecedented.

"Chelsea have become one of the biggest clubs in the world. Abramovich transformed them from a club with great ambition but nothing to back it up to the reigning European champions, the reigning world club champions.

"No matter what happens from this point, they won’t be the Chelsea we’ve grown to know. Abramovich has been loaning them what amounts to £90m a year, nobody does that anymore."

https://www.bbc.co.uk/sport/live/football/60688168