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Australia has summoned Olympic equestrian gold medallist Stuart Tinney to the Tokyo Games amid 16 additions to the nation's team.
Tinney, who won equestrian team gold at the 2000 Sydney Games, has received a late call-up to replace fellow rider Chris Burton, whose horse has been injured.
Tinney will compete at his fourth Olympics as Australia also confirmed the injury-enforced withdrawal of cyclist Jack Haig.
Haig broke a collarbone and suffered concussion in a crash at the Tour de France on June 29.
AusCycling is expected to announce a replacement for Haig in coming days with Ben O'Connor, currently fifth in the tour, a possibility.
Judoka Nathan Jatz has also been added to the Australian team while 14 athletes in soccer, hockey and rugby sevens have received Olympic call-ups.
The additions in the team sports follow a change in squad number regulations by the International Olympic Committee announced earlier this month.
Previously, replacements were available in several sports only in the case of injury to others, but now each replacement can be used in any match.
Australia's overall team for the Tokyo Games starting on July 23 is now 488 athletes - the largest the nation has sent to an overseas Olympics.
Australia's previous biggest team for an away Games was 482 at the 2004 Athens Olympics.
Australia's chef de mission Ian Chesterman said the milestone was unexpected for a team which has been boosted by recent successes of tennis star Ash Barty and the nation's men's basketball team, the Boomers.
Barty last weekend won a coveted Wimbledon title while the Boomers defeated the United States in an Olympic warm-up match on Tuesday.
"The success of the Boomers, the success of Barty, is a huge boost to the morale of the team," Chesterman told reporters in Tokyo on Wednesday.
"Everyone is looking forward to these Games so much and then when you get great Australian sporting achievements like that, it lifts everybody further.
"The Boomers have obviously made a big commitment to these Games and they want to make this successful.
"I know that's the feeling in all the sports. The morale of this team is going to be fantastic."