The 19-year-old is enjoying a successful loan spell with League One side Coventry City.
The 19-year-old is currently out on loan with League One side Coventry City, and has clearly made the most of the opportunity to prove something to his parent club. His tally of 19 goals makes him the joint top goalscorer in the entire division.
And having been able to watch Armstrong closely on Saturday, as Ameobi's Fleetwood Town took on the Sky Blues, the 34-year-old appears to have been convinced that the youngster has what it takes to make his mark at St James' Park.
"The goals are flowing, and he looks super-confident," he told the Chronicle.
"I still think he can be a huge asset to Newcastle in the future if he keeps doing what he's doing, and I said that to him as we came off the pitch and I put my arm around him.
"If he keeps developing and keeps building, keeps putting in the work, then I think he can be a top player at Newcastle. That's what I said to him.
"He's very driven, and you need to be if you want to make it at the top level in this game; you need to have that determination and he's got that in spades."
Although Armstrong would have to make a considerable step up if he hopes to replicate his form from the third tier in the Premier League, his proven ability to find the back of the net may leave some Newcastle supporters wondering just why he was allowed to leave in the first place.
Steve McClaren's men have managed just 27 goals in 26 league games, and that has largely been down to their strikers' form.
Aleksandar Mitrovic, Ayoze Perez and Papiss Cisse have contributed just 12 strikes between them this season, and while it would be foolish to suggest that Armstrong could have made a huge difference to their performance in front of goal, he may have been able to provide the kind of support that would have helped Newcastle's chances of staying in the top flight.