Everyone is familiar with the well-established talents that will be gracing the pitches in Brazil this summer, but what about the young starlets ready to elevate their game? Who is in the best position to join the likes of Landon Donovan in 2002, Franz Beckenbauer in 1966, or even Pele in 1958?

Unlike other under-21 lists, this one is exclusive to players who are actually under the age of 21. The likes of Paul Pogba (21), Joel Campbell (21), Rafael Varane (21) and Romelu Lukaku (21) have been excluded due to age restrictions. All four have been tipped to enjoy stellar World Cup campaigns, but are officially legal enough to purchase alcohol in the United States.

So, who are the World Cup's five most promising prospects? Read on to find out.

1. Mateo Kovacic (20), Midfielder, Croatia

Unlike the others ranked behind him, playing time will not be an issue for Mateo Kovacic. At the club level, the 20-year-old made 32 appearances for Italian outfit Inter Milan. His prowess in individual battles allowed him to average 1.4 tackles and 2.2 dribbles per match. Opposing players were only able to dribble past him an average 0.4 times. He remained a staple during Croatia's World Cup qualifying cycle and will be relied upon to make an impact in Group A.

Who did we leave off our list? Tell us @SportsWN