The 34 year old Croatian international believes that his compatriot Luka Modric is the best midfielder in the world and also thinks the los Blancos would have in trouble without him.
According to the former Croatian international captain the Real Madrid superstar is now in his peak form of his life.
In the year of 2012 the Croatian international captain Luka Modric joins the Real Madrid side from Tottenham and since then he has won several individual trophies and also two Champions league, two Club world cup and Copa Del Rey with them.
Last year the superstar was named the FIFP world XI for his impeccable performance for them.
Real Madrid side extended their contract with Luka Modric until 2020.
The former Croatian International believes that his compatriot has no equal in his position.
He added: "Modric is beyond just a friend, he's the best midfielder in the world right now,"
"I have no doubts; I'm not saying that he is one of the best, I affirm that he is the best.
"Luka has grown over the years, I think he is now at his peak. Since he arrived he has been improving with the team. Real Madrid are having a great run of results, but without Luka they would have problems."
Srna also backed Mateo Kovacic to develop into a leading player for Madrid after an inconsistent first 18 months at the Santiago Bernabeu.
"I'm sure he will do well because he's an incredible talent," he said. "I adore him. Although he has grown a lot as a player, he has not yet realised his potential... but he will eventually.
"He is the future of Madrid. He needs time because in just three years he has gone from Dinamo Zagreb to play at Inter and Real Madrid."
On the other hand Modric’s compatriot Ivan Rakitic is not in good shape this season as he was dropped by the Barcelona manager Luis Enrique, and his future is cast into doubt with Barcelona side.
The former Crotian captain thinks that Rakitic will prove he is worthiness to them.
He added: "Rakitic has demonstrated his quality many times and scored a goal in the Champions League final!"
"I am sure he will work hard to get back to [his] best level. I trust Rakitic very much."