The club investment on the squad should always be based on the plan of the manager. It would be a waste of signings if the club sign players who don't suit the tactical plan of the manager. The problem at Chelsea is that they have lack of coordination between manager and the sporting director. Chelsea failed to put a right person in the position of football director.
If Chelsea decides to sell any of the big players they signed for a huge amount of money for another set of players, they will make a financial error, which will affect the finances of the club because they will lose a lot of money as no team will be willing to buy them with the exact amount Chelsea spent on them because the players respective quality and individual ability have dropped and same as their market price.
Their football directors did not know their jobs, they are after fancy players and big names, not after a good manager who will have a great future at Chelsea, That is why all the managers they signed since the new ownership are not staying for long because they have not given them enough time to build a team.
Maresca is a new figure at Chelsea who is also lacking experience of managing a big club. If he doesn't get a proper backing from the club, it will highly possible that he will fail to meet the club's target. Chelsea need to stop sacking manager in a short period of tenure. Without enough time to build a strong team, any manager will happen to fail with the current competitiveness of Premier League.
He need all the support from the management to succeed in the team and the Premier League.
His lack of experience of coaching big teams should not be a problem since Arteta was able to succeed at Arsenal with support of the mnagement and the fans.