In an interview with the 'Daily Mail' Smith, who turns 18 tomorrow, revealed his delight.
"It's a dream come true. I still can't believe it. I'll probably go back to my hotel room and think about everything.
"I only found out the day before the squad left for Singapore that I was coming. We had a training session on Saturday and the kit man came up to me and said 'Here's your suitcase, you're travelling.'
Smith, who was only born in the year 2000, scored a fantastic effort to equailise in yesterday's game - however Atletico Madrid eventually won the fixture after a penalty shoot-out.
West Ham midfielder Jack Wilshere described Rowe as "something a little bit special", and the youngster wants to kick on from his pre-season success.
The 17-year old wants to feature in the cups and make his Premier League debut this season.
Arsenal's host holders Manchester City in their first Premier League fixture this season.