The Manchester City winger came off the bench to score in both internationals.
"I hope Adam Johnson always scores," said Capello.
"He is a big talent. He is fast. Technically he is really good and is very dangerous player when he gets near the box because he shoots so well.
"When you play in the national team, you have to play like a senior.
"Sometimes he still plays like a young player but he is still a really good player."