He also hit the courts at Sydney Olympic Park on Tuesday to test out the ankle to give himself the best chance of playing. While he understands why some are cynical of his decision,he didn’t feel the need to defend himself.

“I was in contact with Craig and Stephen regularly about the situation,” he said.

“We all worked together to try and get the best outcome. Not everyone is going to understand or see it from my side and that is okay. What my team and I can control is how we go about our business and make sure who needs to know,knows - and we leave it at that.

“It is obviously very difficult. It’s not ideal to have an injury at any time in the season,but that is the risk I run every time I step on court. I was working every day very closely with my team about my progression and speaking with William,my physio,after every session. I tried to be ready for it,but at some point you need to listen to the advice you’re receiving and do what is best.”

Kyrgios was to feature on Thursday’s opening night of the United Cup,scheduled to play against Great Britain’s Cameron Norrie on Ken Rosewall Arena. His withdrawal saw him replaced by Alex De Minaur as Australia’s No.1 male player.

While his omission is a huge blow for tournament officials,who relied on the box office drawcard to sell tickets,Farrow insists he has no reason to doubt Kyrgios’ health status.

“He left it to the last possible moment to confirm whether he was able to compete or not,” Farrow said.

“These things happen in tennis,especially when you’re two weeks out from a grand slam. This is a big event in its own right now.

“There’s $15m[US dollars] prizemoney and 500 ranking points. But as a player,you have to keep one eye on the grand slams. The fact he was here practising,he had every intention to play. Sadly,it’s not to be.”

Watch the United Cup live and free on the 9Network - Channel 9 and 9Gem. Every match will be available live on9Now.