The two strikers started the Newcastle Under-21 side’s Under-21 Premier League clash against their Aston Villa counterparts at Villa Park.
While Armstrong scored both goals in the 2-1 win, 24-year-old Argentine Ferreyra gave a good account of himself during the 81 minutes he was on the pitch.
“His attitude is spot on and that for me is the most important thing in any footballer," Beardsley told Newcastle’s official website regarding Ferreyra. “But tonight he showed good ability.
“He hit the post with a brilliant shot in the first half and is probably disappointed he missed the second one. Then he did a brilliant turn around (Philippe) Senderos and the goalkeeper made a fantastic save.”
Regarding 18-year-old striker Armstrong, Beardsley said: "Arma got two brilliant goals. The first goal was fantastic; we were lucky in the sense that we were in the dugout and so we were right behind it.
“As soon as he hit it, you knew it was in. And it was a great flick around the corner by Siem for the second one, and a great finish.”
Ferreyra joined Newcastle on a season-long loan deal from Shakhtar Donetsk in the summer of 2014.
The 24-year-old arrived at St. James’ Park looking to take the Premier League by storm, but he has been a disappointment.
The Argentine has struggled to adapt to the English game and has not made a single appearance in the Premier League so far this season, although one has to consider the fact that he has struggled with fitness problems.
However, going by Beardsley’s comments, it appears that Ferreyra is progressing well at the moment, although at this point, it is probably too late for him to earn a permanent contract.
Armstrong is enjoying a good season and has been part of the Newcastle first team despite being just 18 years of age.
The England Under-18 international has yet to score in the Premier League this campaign, but he has created three chances and has a pass accuracy of 73% in nine league matches.
One suspects that Armstrong will be involved in Newcastle’s Premier League clash against Swansea City at St. James’ Park on Saturday.