Reports of issues with boss Pepe Mel and senior squad members had surfaced in recent weeks.
But after a morale-boosting and crucial 2-1 win at Swansea - Olsson insists that the whole of the squad is behind Mel.
"The feeling in the dressing room is that everyone is on board and pulling in the same direction," said Olsson.
"It has been a tough time for Pepe, so I'm very happy for the gaffer and the coaching staff.
"We had a really good week in terms of training and we felt we were as well prepared as we could be.
"It is easy to kick someone when they are down.
"But we are an honest group focusing on our bit. That means sticking together and trying to go out there each week and turn things around. Today we did that, so credit to everyone."
Keeper Ben Foster added: "Pepe was absolutely buzzing after the game. You could see it on his face.
"He had a smile from here to here. It's brilliant. It means a lot to him and we are very happy that he has got that win."