Australian batsman Damien Martyn and former New Zealand skipper Stephen Fleming have signed up for this year's Hong Kong Sixes, organisers said on Thursday.
The retired greats are the first two All-Stars players confirmed for the November 8-9 tournament.
"The Hong Kong event is, without doubt, the best-run and most high-profile sixes tournament in the world and, hopefully, we can put on a great show for the fans," Martyn said.
Last year's tournament featured such luminaries as Shane Warne, Brian Lara, Glenn McGrath and Anil Kumble.
The lucrative new iSixes World Series, with stops in Singapore, Shanghai and Dubai, was unveiled this month. The tournament features all nine Test-playing nations with one million US dollars going to the winners.