Schär will link up with Switzerland while Lewis has been named in the Northern Ireland squad – with the two nations set to face each other in a 2022 World Cup qualifier next week.

Centre back Schär could line up for his country in their friendly against Greece in Basel on Wednesday, 1st September, before a home qualifier against Italy on Sunday, 5th September, also at St. Jakob-Park.

Switzerland then travel to Belfast to play Lewis’ Northern Ireland at Windsor Park on Wednesday, 8th September, with both sides vying for Group C points. All three games kick off at 7:45pm BST.

Full back Lewis, meanwhile, is part of Ian Baraclough’s Northern Ireland squad for their three fixtures during the break from domestic club action, with a trip to Vilnius to face Lithuania in a qualifier up first on Thursday, 2nd September (7:45pm BST).

They then play Estonia in a friendly in Tallinn on Sunday, 5th September (5pm BST), before another qualifier against clubmate Schär’s Swiss side a week on Wednesday.

And young defender Oisin McEntee, who is currently part of United’s under-23 squad, could feature for his country as well, having been called up for the Republic of Ireland Under-21s for a European Under-21 Championship qualifying double-header.

McEntee’s side face Bosnia & Herzegovina in Zenica on Friday, 3rd September at 3:30pm BST, before travelling to Dudelange to play Luxembourg on Tuesday, 7th September (3pm BST).