Hong Kong Tennis Open organisers on Wednesday announced that former US Open champion Emma Raducanu will not take part in the tournament, a development that comes on the heels of star player Naomi Osaka's decision to drop out.

With two of the big names out, organisers stressed there will still be an "incredible line-up of marquee stars" at the event.

It pointed out that top players – including defending champion Leylah Fernandez, former world number one Simona Halep, and Wimbledon quarter-finalist Lulu Sun – will be taking part in the event which runs from October 26 to November 3.

The Hong Kong China Tennis Association said in a statement that it was unfortunate that Raducanu will not be participating in the all-female tournament and wished her a speedy recovery.

"Injuries are an unfortunate part of the game, and we do hope that she will be back competing as soon as possible," the statement added.

Raducanu's decision comes after four-time Grand Slam champion Naomi Osaka announced her withdrawal from the tournament.

The 21-year-old Briton continues to rehab from a foot injury she sustained in the quarter-finals of the Korea Open in September.

“I’m sorry to say that I will not be able to play in Hong Kong next week," Raducanu said in a statement through the association. "While my foot is making good progress, I need a little more time before I am match fit," she added.

Raducanu's spot in the draw has since been filled by 2020 Australian Open winner Sofia Kenin.