It's hard to say whose problem it is, Chelsea's or the coach's... Lampard's return looks very bad, defeat after defeat and only one win. It's hard for me to say if it's the players in particular, it's probably the tactics of the coach who can't get the players on the pitch to play more confidently
Chelsea's problem is very complex, they are bad in every way. This may indeed be due to the coach being unable to provide a strategy that suits the players, and also the Chelsea players who seem to be less motivated and unable to apply the tactics provided optimally, or indeed their players are simply not competent. support so that Chelsea is currently in a bad point like this.
Even this crushing defeat against Man United actually closed Chelsea's career at the end of the season. They can't even qualify for the European League.
Too many factors as Chelsea is having worst end of this season and now matter is not about UEFA qualification they are ending this season with 11th or 12th spot which is worst for them in years and this all happen just because of change of ownership after this we have three coaches change and things gone on wrong way which create problems even they have top quality players, but sadly they were doing things without any strategy, so they have to face consequences.
In next season can they improve, or we have to face troubles again it's never been clear because now English Premier League is not easy for the top teams with Arsenal and Newcastle United and Manchester United are strengthening their squads power for competing teams like Manchester City and Liverpool so if they want to do better than surely they need to work on better strategy.
The problem for the top brass at the beginning of the season has not been resolved well which in the end spread everywhere including the coaching staff and players which made them even more destroyed.
It is difficult for Chelsea right now but this will certainly be a good learning because with this they indirectly have to start from scratch and improve all sectors for next season.