No man, the problem has come when so many sanction happened caused by chelsea owned by abramovich. Last year chelsea was still showing a very good performance but due to the so many sanctions and that was making so many players were loosing their spirit. Chelsea has entered into the some final battle in some competitions. that was showing how credible the team was during that time.
Yes, the problems that befell Chelsea last season did affect the team, so their performance decreased slightly. Although many say "it shouldn't lower their performance" But we don't know for sure what happened to the team as a whole. Because what we know is what appears on the outside. It's very difficult for Chelsea to stay optimal in these circumstances.