The talented teenager has been among the goals for England this week.
Armstrong was in top form as England under-18s defeated Switzerland twice in two days. He scored the winner in a behind closed doors affair at St Georges Park and also netted twice in a 6-1 win at Walsall's Banks Stadium. It takes the Geordie to 19 goals in 24 games for England and he certainly looks like a star of the future.
Speaking to TheFA.com, Armstrong said this regarding a recent chat with England's leading light:
"I played against him at Old Trafford, and he said he liked the way that I always got across the defenders,” said the 18-year-old.
“He said that the Manchester United team had watched me in the clips before the game - that was a massive confidence booster for me to have someone like that say that.
“I asked him what I can do for myself to improve as I try to play in the same way as him.
“He gave me loads of tips and advice. He told me that I always need to have confidence when I play and never be afraid to get my shots off.
“As a striker, he just said that I always need to have the belief to go again if it wasn’t happening for me and the only way to reach the top level is to continue working hard every day."
Armstrong, who has played 10 league games for Newcastle, and made his first start for the team in the Boxing Day fixture with Manchester United on Boxing Day last year.
Rooney's goal against Lithuania this week took him to 47 strikes for the national team, so his advice is certainly worth taking on board for the Newcastle talent Armstrong.
The 18-year-old is certainly one to keep an eye on. Newcastle fans hope that he can go on to be as big an impact player as Rooney currently is.