Xherdan Shaqiri played 45 minutes for Switzerland on Sunday evening, while Conor Bradley made his senior international debut for Northern Ireland.
Liverpool's No.23 started his country's friendly against USA in St Gallen before being substituted at half-time. Switzerland won the match 2-1.
Seventeen-year-old Academy defender Bradley, meanwhile, came off the bench late on as Northern Ireland beat Malta 3-0.
"It was unreal," Bradley said.
"The gaffer came over to me and said, 'You're getting on'. I just had goosebumps and it was an unbelievable moment. I'm proud of me and my family. Just unreal."
🔥 International debut at 17 ✅ Congrats to @LFC defender Conor Bradley #GAWA #LFC 💚 https://t.co/2vX6iQaGLR— NorthernIreland (Northern Ireland) 30th May 18:44