Drysdale won back-to-back Olympic gold medals in 2012 and 2016.
New Zealand's female rowing contingent boasts 12 world champions.
Zoe McBride has spoken out about the mental and physical toll struggles that have forced her to walk away at just 25 years old.
The 25-year-old had won world titles in lightweight double and single sculls.
The former World Cup gold medallist is taking an "indefinite break" from the sport.
The Kiwi single sculls supremo will seek his third straight gold medal in 12 months.
The 1988 single sculls bronze medallist had been battling cancer.
The world recordholder beat the two-time Olympic champ by eight seconds.
The former single sculler is now focused on a men's double bid at the Tokyo Olympics.