Eddie Howe's side take on Benfica at the Estadio da Luz, Lisbon, on July 26.
The club are also planning to take on Burnley in the city in a behind-closed-doors training fixture three days earlier.
Newcastle beat Burnley 2-1 at Turf Moor on the final day of last season. United have since signed Nick Pope from the club, now managed by Vincent Kompany.
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Meanwhile, Newcastle play Mainz 05 in Kufstein, Austria, tomorrow.
