here is something of what the Chilean press says about Ben: 

The positive debut of Ben Brereton that excites the Red

The Chilean nationalized English striker Ben Brereton made his debut for La Roja and left a good image against Argentina.
The Blackburn Rovers striker played the last 13 minutes of the match against Argentina, time that was enough for him to show some of his qualities. He showed speed, fought balls, ran, held in the area, showed skill and even cleared balls at critical moments. He entered very plugged in, and he got on perfectly with his companions. Martín Lasarte wins a more than valid alternative for the attack.

The British had no problems helping in the back, with sacrifice, clearing an occasional center, with delivery. He had only been on the field for five minutes and it seemed that he had played his whole life in the National Team, because he complemented himself very well with his teammates, in all sectors and in all facets of the game.
And although Martín Lasarte's team was focused on defending, the striker did not neglect his central task, which was to attack. And he did well, despite the fact that Chile practically did not have the ball and was completely besieged by Lionel Messi and company.
Even so, it managed to be an outlet and create danger in the trans-Andean area. In fact, when the national team was able to come out of a counterattack a couple of times, Ben Brereton was very prominent, exhibiting great speed and skill. In that last play and like an experienced 9, the attacker held a ball very well in the opposite area, which then Charles Aránguiz finished off and missed

In just 13 minutes, Brereton delivered. And although it is early to draw definitive conclusions about his performance and what his real contribution may be, the image he left in Rio de Janeiro is more than positive. And also hopeful, because in Chile there are not many center-forward of his characteristics. More than one may criticize Lasarte - and rightly so - for not having made him play against Bolivia, when the match required a net attacker.