The teenage striker vowed to give everything as he attempts to establish himself at Newcastle United.
He only turns 17 on Monday.
Alan Pardew has promised Armstrong – who has been prolific at Under-18 and Under-21 level this season – an opportunity between now and the end of the season.
Alan Pardew: “He’s doing absolutely brilliantly for us.
“He’s flying the flag for the Academy at the moment with his attitude, his application and his quality.”
Adam Armstrong: “It’s been good to be involved in the first team.
“I’ve just got to work hard every day on training, and hopefully I’ll get a chance. It’s important that I give everything whatever level I’m playing at.”
England Under-17 international is on the verge of the first team with Pardew short on striking options.
Leading scorer Loic Remy is suspended and striker Papiss Demba Cisse sidelined with a back problem.
Armstrong has scored 13 goals for the club so far this season. He has scored another seven times for his country.