Of course it wasn't nice to see him getting a red card in his first official match with them already. But it was a really unlucky red card at the same time. He didn't have a bad intention but he couldn't save himself from that incident. It was too late for that after the sliding tackle attempt. He must also be very regretful for that and I'm pretty sure he will be more careful from now on. Felix still seemed passionate in the Fulham match before the red card. Potter should continue giving him chances as much as possible.
Chelsea has a squad filled up with recently signed players, and I am not even sure how they are even going to use all of them. Speak of wasting money, Chelsea is at the very top.
Joao is one of the better players and it's too much to judge him on a poor debut.
He still has time to adjust to himself at the moment but must be mentally strong because the blasphemy will surely continue even if he is a new player because his debut did not go well.