The Manchester City star, who is also De Gea's compatriot, says he can see the United shot stopper becoming Spain's first-choice goalkeeper in the long-term.
De Gea progressed through the youth ranks of the Spanish national side but has been unable to prise the senior goalkeeper's jersey away from the likes of Iker Casillas and his deputies Victor Valdes and Pepe Reina.
The 23-year-old has enjoyed a strong season at Manchester United, however, and City midfielder Silva believes De Gea has a bright future ahead of him with the Spain squad.
“I wish David de Gea the best, obviously. He had a very difficult first year at United," Silva is quoted as saying by the Daily Mirror.
“I don’t know him that well on a personal level, but he’s a fantastic goalkeeper and, hopefully, he will make it.
“He’s young with very good conditions as a goalkeeper and I can see him becoming Spain’s No.1.”
And Silva also spoke about another fellow Spaniard - Juan Mata - who moved to Manchester United for £37.1 million in January.
The 28-year-old was discussing his cross-city rivals ahead of the Manchester derby on Tuesday night - a must win game for both sides, for very different reasons.
“It’s a very difficult situation because the team is not playing that well,” Silva said.
“They have not managed to bring the best out of him, but he’s a very talented player, and he will show it. I know him very well. We played together many years. He’s also a great guy and I’m sure it will work out for him."
Silva will be hoping to catch his compatriot out in midweek however.