Croatian tennis star Borna Ćorić believes Roger Federer will continue to win Grand Slam titles in 2021.

Federer has won 20 grand slam singles titles during his career but underwent surgery on his right knee in February.

But after suffering a ‘setback’ with his rehabilitation, the 38 year-old announced earlier this month he will miss the 2020 season, and is looking to return strong next year. 

Ćorić, the world No 33, believes Federer is ‘certainly capable’ of winning more major titles next year.

He said: "We have been asking ourselves for the previous ten years, is this the last year of Roger Federer's career. 

"Still, he keeps coming back, winning more Majors and other tournaments. It will not be easy for Roger to repeat that in 2021 but is certainly capable of doing that.

“Many people had said he couldn't do that anymore, being too old, and then he comes back equally strong or even better. I'm not going to doubt him until he officially retires.”

In 2016, Federer had knee surgery but returned the following year to win both the Australian Open and Wimbledon.