At the London stadium, with the score locked at 1-1, Forest skipper Morgan Gibbs-White won and converted an 89th minute penalty for the winner.
Soucek said at the final whistle: "For me it is a joke. I just saw it again and I think we can have 20 penalties per game if it is like that. I came to the Premier League because I thought it was the toughest league in the world and we are all fighters and warriors, but this looks more like basketball when you can't touch the player. This is what I saw
"(Alphonse Areola) is the same in the dressing room. He didn't know who was fouled. He came for the ball, I think I cleared it and that was already out. We didn't know why there was VAR and then the penalty, so it was tough for all of us."
Soucek also said of his teammates: "We have to show the honesty between each other. The truth of who cares and who not. We have to do it because if someone is easy to play and relaxed he has to be out of the squad. We will look to the mirror and know the position we are in and nobody from the squad wants to play second division next season."
On manager Nuno and his position, he added: "We have to be behind the manager always, until the end. I believe he can be a big help for us because he did a lot through the Premier League already. It's on all of us, Nuno as the manager, us as the players, the whole training ground. Especially for him I want to keep going and do the maximum, we don't want them to lose their jobs. All of us, even for the fans, we need to stick together."