The Magpies are no longer in European competition for this season, due to their league position last term.
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However, that has not led to Guimaraes seeking a move away from the club, despite links to Paris Saint-Germain, Arsenal and Manchester City.
He told reporters: “I am always here. I never said that I would like to leave.
“I didn't know anything about it (speculation). My focus was always Newcastle. I'm very happy.
“The gaffer has given me a big responsibility to be in the leadership group. I want to be a leader. I want to help the club in many ways.
“Since I've been here, I've developed my game a lot. I'm grateful to him and his staff. Now I think it's time to deliver something special.”