You can find a full list of all the Newcastle players involved here - and a run-down of how they got on below.
Nick Pope and Kieran Trippier
Friday 23rd SeptemberItaly 1 England 0San Siro
United stopper Pope was handed a start at San Siro by Gareth Southgate, but was beaten by Giacomo Raspadori's strike with just over 20 minutes left on the clock. Trippier, meanwhile, remained on the substitutes' bench for the defeat in Milan.
Monday 26th SeptemberEngland 3 Germany 3Wembley Stadium
Goalkeeper Pope was handed England's number one shirt at Wembley, and had an eventful evening between the posts. He was beaten by Ilkay Gundogan's penalty and Kai Havertz's effort before the hosts fought back to lead thanks to Luke Shaw, Mason Mount and Harry Kane's spot kick. But the Magpies man's mistake allowed Havertz to stab home a late leveller for Germany, with teammate Trippier remaining on the bench throughout.
Ryan Fraser
Wednesday 21st SeptemberScotland 3 Ukraine 0Hampden Park
Winger Fraser impressed during his cameo in Scotland's comfortable UEFA Nations League win over Ukraine on Wednesday, recording a pair of assists for Lyndon Dykes' late double.
John McGinn put the hosts ahead in Glasgow before Fraser replaced Stuart Armstrong for the final quarter of an hour, and just four minutes later the Magpies man sent over the corner for Dykes to nod home his side's second of the night.
And with three minutes left, they repeated the routine, with Fraser delivering another corner onto the head of Dykes to make it 3-0 and round off an impressive win.
Saturday 24th SeptemberScotland 2 Republic of Ireland 1Hampden Park
Fraser made another appearance from the substitutes bench as Steve Clarke's men recorded another victory, with the Magpies man entering the fray - again in place of Armstrong - for the final half an hour.
Tuesday 27th SeptemberUkraine 0 Scotland 0Marshal Jozef Pilsudski Stadium
The former Bournemouth wideman was handed a start by Clarke and played 72 minutes as Scotland sealed their Nations League promotion.
Chris Wood
Thursday 22nd SeptemberAustralia 1 New Zealand 0Suncorp Stadium
The Newcastle frontman - the All Whites' all-time record goalscorer - started up front and captained his country for the friendly in Brisbane, but was unable to help his side find a way through as Awer Mabil's goal just after the half hour separated the two sides. Wood completed 71 minutes before being replaced by Callum McCowatt.
Sunday 25th SeptemberNew Zealand 0 Australia 2Eden Park
Wood started up front again for New Zealand, but was withdrawn just after the half hour after picking up a knock in Auckland.
Bruno Guimarães
Friday 23rd SeptemberBrazil 3 Ghana 0Stade Oceane
Guimarães was named among the substitutes for Brazil's convincing win in Le Havre, but wasn't called upon as Richarlison's brace added to Marquinhos' opener to seal the victory.
Fabian Schär
Saturday 24th SeptemberSpain 1 Switzerland 2Estadio La Romareda
Schär was named among the substitutes as Switzerland recorded an impressive win in Spain, but he didn't get on as Eric Garcia's own goal settled the contest in their favour.
Tuesday 27th SeptemberSwitzerland 2 Czech Republic 1Kybunpark
The Magpies defender completed the full 90 minutes for Switzerland as they secured a victory in St. Gallen.
Miguel Almirón
Friday 23rd SeptemberParaguay 1 UAE 0Stadion Wiener Neustadt
Almirón completed the full 90 minutes for his country as they ran out winners in a friendly thanks to a goal from Fabian Balbuena.
Tuesday 27th SeptemberParaguay 0 Morocco 0Estadio Benito Villamarin
A relatively low-key 90 minute outing for Almirón, as his side played out a friendly stalemate in Spain.
Jamal Lewis
Saturday 24th SeptemberNorthern Ireland 2 Kosovo 1Windsor Park
Lewis was handed a start for his country in Belfast and completed 77 minutes before being replaced by former Newcastle full back Shane Ferguson, just prior to the hosts' late fightback.
Tuesday 27th SeptemberGreece 3 Northern Ireland 1Georgios Kamaras Stadium
The ex-Norwich man started again for Ian Baraclough's men but was withdrawn with 15 minutes to go in their defeat in Athens.
Alex Murphy
Wednesday 21st SeptemberRepublic of Ireland Under-19s 6 Gibraltar Under-19s 0Central Park
United youngster Murphy played 90 minutes for his country in their European Championship qualifying win over Gibraltar in Wales, and turned in an encouraging display, setting up his side's fifth goal with a cross for Nathan Fraser to head home. The teenager also went close to netting himself, striking the woodwork in the second half.
Saturday 24th SeptemberWales Under-19s 0 Republic of Ireland Under-19s 2Nantporth Stadium
Murphy helped his side record a clean sheet and a comfortable win in Bangor, playing the full 90 minutes.
Tuesday 27th SeptemberRepublic of Ireland Under-19s 1 Hungary Under-19s 0Nantporth Stadium
The teenage defender was named on the bench and wasn't called upon to feature in Ireland's final outing of the current international period.
Lucas De Bolle
Thursday 22nd SeptemberNorthern Ireland Under-21s 1 Scotland Under-21s 3Danny Blanchflower Stadium
Magpies youngster De Bolle, who is currently on loan at Hamilton Academical, made an 85th-minute substitute appearance as his side ran out comfortable winners.
Sunday 25th SeptemberScotland Under-21s 1 Northern Ireland Under-21s 1The SMiSA Stadium
De Bolle started for the Scots in Paisley and made his presence felt, recording an assist with a well-weighted pass for Flynn Clarke's opener. Dale Taylor levelled the scores, but De Bolle went close to a winner with a shot that whistled past the upright.
