"It's a great opportunity. I'm the type of player who loves challenges. I had a challenge going to Atletico in the first place, changing countries, different league, now I'm at Newcastle.
"I know the position they're in and I'm here to help as much as I can on and off the field."
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Trippier has been managed by Howe before, with the current Newcastle manager signing the right back from Man City when he was Burnley manager in 2012.
He added that this also played a big part in him deciding to swap the red and white of Atleti for the black and white of the Toon.
"I have a great relationship with the manager as everyone knows," Trippier continued. "I've worked with the manager before.
"I'm the type of player who loves a challenge and this is certainly a challenge for me and one I'm excited about."
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Speaking about Trippier's move, Howe said: "It’s a sign this club has a huge pull and I’m not talking financially.
"Kieran hasn’t come here for financial reasons, he’s come for this club and its challenge and the longer-term vision.
"Hopefully with his signing, others players around the world will share his dream and vision."
Trippier will make his debut for Newcastle in their FA Cup 3rd round tie at home to Cambridge United.