That is why they say to work with patience and hard work so that there is no mistake and regret it later and in the same way this player must be regretting his haste that if he had not been like that, maybe he could have achieved what he haste for. Chelsea is a good team and I know that if Chelsea is telling someone something for the better, he will do it for his player and not to look down on him.
If he improves his effort and goal-scoring ability, I believe he can become a better player because there is a difference between effort and performance, some have less and some have more, but we can increase it, for which we need effort. You can also say that that player is not playing well to improve any team, while he could not do anything good in such a good team, then what will he do in other teams?
Chelsea have been improving in latest seasons and this title in FIFA Club World Cup can be a milestone for this player generation's maturity and they have shown off their readiness to win big titles in future. Beating the strong PSG is not easy but Chelsea did won very big in the final match, that is like a slap to PSG and their pride.
Many clubs in Premier League will look at Chelsea win against PSG and do more analysis about the tactics used, players they have in order to figure out some possible solutions for constraining Chelsea in a next season. Chelsea will not humbly look at top four in Premier League but will try to win this title.