The 19-year-old forward has been a huge success after joining third-tier side Coventry City on loan last summer, hitting 19 goals in 27 appearances for the Sky Blues.
That tally has seen him top the division's scoring charts and make the step up to the England Under-19s side, and the lifelong Mapies fan now has his sights set on bigger things.
He told the Sun that he does not see any reason why he cannot mimic the achievements of his hero Rooney, and revealed that he has received advice from the Manchester United and England star.
Armstrong said: "Rooney is the type of player who likes to drop in and get on the ball. I think I’m capable of doing that. I met Rooney when I went away with the [England] Under-18s. He came into one of our meetings. I stayed behind and asked him questions about what I need to do to improve myself.
"He said to just keep doing what I was doing, stay behind after training, do your finishing stuff and things will go well. I started at Old Trafford for Newcastle so he said he knew of me, which was a massive thing. He said he had watched clips and I popped up on one of the goals. He said ‘You always get across the front post, keep doing that and you’ll get a lot of goals’.
"He’s scored over 50 goals for England which is a massive achievement. I know it’s every kid’s dream, but I think if I keep doing what I’m doing I don’t see why I can’t."
Armstrong is regarded as one of the brightest talents to emerge at St. James' Park in recent years, and he had already played 19 times for the club's first-team, albeit almost exclusively as a substitute, before moving to the Ricoh Arena.
He extended his loan at Coventry until the end of the season last month, and his goals have helped the club sustain a serious challenge for promotion to the Championship.