Valencia and Argentina legend Mario Kempes has told Paolo Dybala he needs to believe himself to reach his full potential.
Dybala quickly emerged as one of Argentina's most exciting young talents when he made the move from Instituto to Palermo in 2012.
The silky forward finished his final season in Sicily with 13 goals and 10 assists, piquing the interest of Italian giants Juventus.
Juve forked out €32million for the then-21-year-old, and Dybala immediately set about repaying their faith.
In his first three seasons in Turin, Dybala scored 19, 11 and 22 goals in Serie A.
But his production has seen a dramatic reduction in the last three campaigns, blighted by injuries and poor form.
Dybala is still a revered talent and has drawn interest from some of Europe's biggest clubs.
And Kempes has implored the 27-year-old to believe in his own abilities if he wants to get out of his current state.
"At Juve he has played some great games, but he doesn't always get up to speed," Kempes told TribalFootball.com.
"He sometimes doesn't know the potential he has, when he truly believes that, I think he will explode as a player.
"Dybala should be the next big thing for Argentina. We're all waiting for him, but he still doesn't quite believe it perhaps.
"If you look at the glory days of Claudio Lopez at Valencia CF, he grew and grew and became a natural goalscorer who believed in himself and took on and beat top sides like Van Gaal's FC Barcelona time and again…and that was a really great Barcelona side too.
"But once captain Gaizka Mendieta got the ball from midfield and sent inch-perfect long passes to Claudio Lopez in attack, it was game over and Lopez was victorious and proved his worth."