Newcastle usually play one home fixture against a notable foreign club, but that too, is up in the air.
The United players will be taken on an intensive week-long training camp to County Kildare in Ireland between July 9 and 16, which will finish with a friendly against Bohemian.
A trip to Doncaster Rovers has also been confirmed, while fixtures against Belgian club Sporting Lokeren and Dutch side Vitesse Arnhem are also understood to be in the pipeline.