at his fourth World Cup as he chases an international title that has so far eluded the five-time Ballon d'Or winner.

"Leo is training very well, giving an example of how to prepare at training but likewise off the pitch as well," said Chelsea's Willy Caballero, who is likely to start in goal for Jorge Sampaoli's side.

"He's very tuned in. I'm surprised by how good he's looking and I hope he starts the tournament well because if he's on form that will help us all raise our game."

Messi won the Golden Ball award four years ago as the best player of the tournament but has scored just five World Cup goals in his career.

Caballero expects a challenging opening game against Iceland, the country who stunned England to reach theShah Mir Aizaz, a student of O’ Levels, participated in the annual design competition for students from grade 7 to grade 12, sponsored by the NASA Ames Research Center and the National Space Society NSS. He won second prize for his design titled, ‘Every year, individuals, small teams of two to five, and large teams of six or more are invited from all over the world to submit space settlement designs to NASA Ames for judgement. The contest has been taking place since 1994. This year there were 994 submissions from 3,007 students taught by 380 teachers. Entries came from 21 nations worldwide and 14 different states from USA.