Armstrong is regarded as one of the hottest prospects breaking through at St. James’ Park, but his task of breaking through at Newcastle is a difficult one.
The Magpies have a host of talented strikers to pick from, and although Benitez admits he is willing to hand Armstrong a chance, the Spanish boss has also suggested that a loan move could be possible.
“We don’t know what will happen, he is a young player who has the potential but I want to be sure to do my best for the team and the best for players,” Benitez said.
“Maybe he will start with us. He is training well and he is doing fine.”
Armstrong blasted in 20 goals for Coventry City in League One last term, during a productive loan spell.
The 19-year-old appears to be ready to make the step up to Championship level, but Newcastle have concerns about strengthening a divisional rival.
Newcastle are the favourites for promotion, and do not wish to hand one of their competitors a potentially lethal striker.
Armstrong has attracted the attentions of a host of clubs, but Newcastle have so far rejected any enquiries.
Newcastle start their season with a match against Fulham on Friday evening, and it seems likely the best Armstrong can hope for in that fixture is a place on the substitutes’ bench.