Twenty-time Grand Slam champion Roger Federer and British number one Johanna Konta have both withdrawn from this summer's Tokyo Olympics.

39-year-old Federer, has suffered a setback with an existing knee injury.

The Swiss legend won doubles gold at Beijing 2008 and silver in 2012, but lost the singles final to Andy Murray.

30-year-old Konta, has contracted Covid after withdrawing from Wimbledon when a member of her team tested positive and she was identified as a close contact.

Federer, now ranked number nine in the world, had two knee surgeries in 2020.

In the past two years he has seen his Grand Slam tally equalled by Spain's Rafael Nadal at the 2020 French Open and most recently by Serbia's Novak Djokovic - who won a 20th major at Wimbledon 2021.

After losing to Poland's Hubert Hurkacz in the quarter-finals of Wimbledon Federer told reporters he was unsure whether he would play at SW19 again.

Konta pulled out of Wimbledon before it started as she was forced to withdraw and isolate when a member of her team tested positive for Covid.

Konta has only been able to play 15 matches this year because of injury and Covid-related constraints.