Lennon, 22, offers an alternative to Theo Walcott, who has a side strain and will miss the friendly against Slovenia on Saturday followed by the World Cup qualifier against Slaven Bilic's men four days later.

Capello is keen to unleash pace on Croatia after Walcott devastated them with his speed in Zagreb earlier in the season.

"Lennon can play one-on-one and is very dangerous because he's quick," Capello said. "Potentially he is really good.

"He's young. He needs to understand his potential and have confidence in this potential. It's really important because some players are really good but don't understand their own potential."

Capello watched Lennon last week when his winner against West Ham send Spurs to the top of the Barclays Premier League.

"He can shoot with his left or right - he scored a goal against West Ham with his left," Capello said. "But I think he has to improve the confidence in himself.

"I saw the game against West Ham and he played well but we have always followed him because he has already played with us. He is a very interesting player. He is young. When a player is fit and in good form I put him in the squad.

"Always the quick players are really important. But not only speed, because you have to be good technically."

Capello also has David Beckham and Shaun Wright-Phillips competing for a place on the right flank.

"I have a lot of choice on the right. I'm happy." he added.