There are no doubts Lionel Messi will lead Argentina at the 2018 World Cup in Russia, according to national team masseur Marcelo D'Andrea.

Messi announced he will retire from international football after suffering defeat in the Copa America Centenario final against Chile on Sunday.

The loss was the fourth time Messi has tasted defeat in a major tournament final, leading to the 29-year-old's decision to step away from international soccer. 

But D'Andrea says Messi did not notify anyone of his decision within the camp, and is confident the Barca star will represent Argentina once again. 

"I have no doubts that Leo will play at the [2018] World Cup," he told FM Pop. "I have a lot of faith in him and we must leave him alone for now. I trust him in his silence. He loves the national team and he will do everything for his country."

He added: "No one knew anything about Messi's retirement. He didn't say anything in the locker room. It is the hardest blow he has received with the national team, without doubt. He is one of my best friends and it is hard to see him how he is feeling."