Mackenzie Arnold became West Ham United's first new signing ahead of the 2020/21 Barclays FA Women's Super League season when she joined the Irons in July 2020. 

A three-time winner of the W-League Goalkeeper of the Year award, Arnold was born on the Gold Coast, Queensland. She began her professional career as a teenager with Perth Glory before switching to then-champions Canberra United in 2012. 
 
Following ten appearances for Canberra, which led to her first W-League Goalkeeper of the Year honour, Arnold moved to Western Sydney Wanderers, where she was unfortunate to miss a significant portion of the season due to injury. 
 
The shot-stopper returned to Perth Glory in 2014, making 22 W-League appearances over two seasons and helping her side to win the Premiership in her first campaign back with the club.

A two-year spell with Brisbane Roar would follow for Arnold, with the goalkeeper once again claiming the W-League Premiership and the Goalkeeper of the Season award, before the Australian international moved on loan to Toppserien side Arna-Bjørnar. 

A brief spell with Chicago Red Stars followed, in the National Women’s Soccer League, before Arnold returned to Brisbane to represent Jake Goodship’s side in the W-League again. 
 
Arnold was included in the Matildas squad for the 2015 Women’s World Cup in Canada and the 2016 Olympic Finals in Brazil, and was the her country's starting shot-stopper in the 2017 Tournament of Nations, which Australia won with a 6-1 thrashing of Brazil. 
 
Arnold was also a part of the Australia squad that won the inaugural 2019 Cup of Nations. 

The goalkeeper made 21 appearances for the Hammers during the 2020/21 campaign, and represented her country at the 2020 Summer Olympics in Tokyo. 

Arnold was once again the preferred goalkeeper for the Hammers going into the 2021/22 season, playing 21 times for the Irons. She would also represent the Matildas at the 2022 Asian Cup in India, where Australia made it to the quarter-final stage. 

In the 2022/23 season, Arnold was in superb form, playing 27 of West Ham's 29 appearances that season, and being awarded the 2022/23 Players' Player of the Season by her teammates. In the summer of 2023, Arnold was Australia's No1 at the 2023 Women's World Cup in Australia and New Zealand, where the goalkeeper helped her nation to the semi-final stage.

Ahead of the the 2023/24 WSL campaign, Arnold has made 69 appearances in total for the Club. 

Follow Mackenzie on Social Media:

X (formally Twitter): @MaccaArnold1

Instagram: mackenziearnold