Athletico hoped the England international would stay, but the defender made it clear he wanted to return to his home country.
His medical will take place on Tyneside today (Wed 5th Jan) with personal terms not thought to be a problem.
The 31-year-old will become the first signing of Newcastle’s Saudi-backed regime.
Magpies boss Eddie Howe worked with Trippier while in charge of Burnley, signing the right-back from Manchester City in January 2012 after an impressive loan spell at Turf Moor.
Newcastle’s owners hope to recruit at least three more players this month as they look to keep the club in the Premier League.
They are second-bottom in the table having played 19 matches in the league this season, two points from safety.
Will Trippier deal trigger more arrivals?
Sky Sports News’ Kaveh Solhekol told the Transfer Show:
It’s fantastic news for Newcastle fans.
I think other players that have been contacted by Newcastle will now be looking at Kieran Trippier and thinking, ‘Well, he’s an England international, he is going to make…
