Arsene Wenger singled out two Arsenal players for praise after the pre-season victory over Benfica.
The Gunners continued their impressive summer form with a 5-2 win over the Portuguese side in the Emirates Cup on Saturday.
Theo Walcott scored twice, while Olivier Giroud and Alex Iwobi also found the scoresheet.
It marked the first Emirates Stadium appearance for summer signing Sead Kolasinac, who joined on a free transfer from Schalke.
Wenger was impressed with the left-back, but also with youngster Reiss Nelson, who has featured heavily this summer.
“I think he has gone in pre-season from strength to strength,” Wenger said of Kolasinac. “He started a bit nervous but every single week he has improved.
The first two goals came from him. He’s powerful and his ability going forward is very good.”
On 17-year-old Nelson, the manager added: “He’s a player from our academy.
“He’s had an encouraging pre-season. He’s shown you can go past people. He’s not fazed. It’s good for his confidence levels.”