Tomic courted controversy at this week’s Mutua Madrid Open when he was accused of tanking - failing to try his best – during his straight sets defeat to Italy’s Fabio Fognini.

The 23-year-old turned his racket upside-down when facing a match point against his rival, as he exited the competition 6-2, 6-4.

When asked about his actions following the match, Tomic told the Australian newspaper Gold Coast Bulletin: “Would you care if you were 23 and worth over $10 million?”

Chiller has criticised the actions of the Australian player, who is currently the country’s second highest ranked men’s player at 22 in the world, one place below his compatriot Kyrgios.

“I think it was appalling behaviour,” Chiller told the Australian Associated Press.

“It goes against every value that all the Olympians live by, it goes against everything that we’ve been trying to build in this team.

“I would not want to see any of our Olympic team members behave in that way.”

Tomic was previously accused of failing to try his best in a defeat to American Andy Roddick at the 2012 US Open.

His team-mate Kyrgios has also been the focus of attention in recent months, having been given a suspended 28-day ban for comments made about Stanislas Wawrinka’s girlfriend during a Rogers Cup match in August.

He was also forced to deny tanking at Wimbledon in 2015 when he was beaten by France’s Richard Gasquet, while Tomic previously claimed Kyrgios had faked an injury to miss Australia’s Davis Cup tie with the United States in March.

The pair will need to be nominated for the Olympic team by Australia Tennis, but the Australian Olympic Committee have the final say on who to include.

“Every athlete is under the microscope now,” said Chiller.

“There are a few athletes that are on watch and those two names are among them.”