Sigurdsson has been linked with a move away this week.
But he told the club's website: “It is easy to see why the manager has been so successful around Europe and we picked up straight away when he came in.
“We are very organised defensively, he does a lot of work on that.
“He is a cool guy and creates a good atmosphere in training.
“He keeps every player happy and speaks to everyone. He'll talk to you in the canteen about whatever is happening in the world.
“He'll ask about you and what's happening in your life. He has the ability to make all the players feel relaxed and tries to get the best from every player.
“He has done it with the best in the world and won trophies throughout his career and you trust in everything he says."
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