Top 5 current players who are under 20 years of age

#3. Gianluigi Donnarumma - AC Milan

Donnarumma has already established himself as one of the best defenders in the world

Gianluigi Donnarumma has been tipped as one of the finest young goalkeepers in world football, having established himself as Milan's No.1 as a teenager. Donnarumma made his first appearance for AC Milan in 2015 when he was just 16 years of age.

The starlet made his senior International debut at the age of 17 thus becoming the youngest goalkeeper ever to appear for Italy.

Since then, Gianluigi Donnarumma has only got better with age. Long considered one of Italy's most exciting prospects and successor to Gianluigi Buffon, Donnarumma has impressed everyone with his astute goalkeeping skills.

Donnarumma maintains good reactions and is efficient at stopping penalties. Donnarumma just needs to work on his positioning and distribution to become a world-class goalkeeper.