Speaking to the French press, Marcel said: "Chelsea have to win the Premiership and get to the semi-finals of the Champions League, or there is a problem. There will be more pressure next season, and if we fail then it will make the supporters disillusioned.
"If three, four, or at most five players are brought in, then Chelsea will definitely have to win something and they will have a great chance of doing that.
"But if they decide to make more changes than that, it would be more difficult for us to win a trophy.
"As for this season, I think it has been a successful one, even though we have not won anything. I think people should be positive about what Chelsea have achieved."
It's about time someone had a positive outlook on things!