Buenos Aires, June 10 -- Argentina manager Lionel Scaloni heaped praise on teenager Franco Mastantuono ahead of the River Plate midfielder's expected move to Real Madrid.

The Spanish club has reportedly agreed to a deal worth 45 million U.S. dollars for the 17-year-old, who made his international debut in Argentina's 1-0 win over Chile in Santiago last Thursday.

"Going to Real Madrid is a huge thing," Scaloni told a news conference on Monday on the eve of Argentina's home World Cup qualifier against Colombia.

"We're talking about the best or one of the best clubs in the world. It's a huge step for him and obviously he's still only 17."

Mastantuono has been a revelation for River Plate this year with seven goals and four assists in 1...