|Full name||Trent Lucas Sainsbury|
|Date of birth||5 January 1992|
|Place of birth||Perth, Australia|
|Height||1.84 m (6 ft 1⁄2 in)|
|Playing position||Central Defender|
|Current club||Central Coast Mariners|
|2008–2009||Perth Glory Youth|
|2010–||Central Coast Mariners||52||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 8 December 2013.
† Appearances (Goals).
Sainsbury began his youth career at Perth Glory in 2008 before moving a year later to the AIS where he was part of their National Youth League squad in the 2009-10 season. In 2010, Sainsbury was signed by the Central Coast Mariners where both he and fellow Central Coast Mariners team mate Marc Warren were selected to spend two weeks at Sheffield United’s Academy as part of the two clubs' partnership.
His senior debut came for the Mariners on 24 November 2010 in the F3 Derby against the Newcastle Jets, making a total of 9 appearances in the first team that year. During the successful 2011-12 campaign which saw the Mariners win the A-League Premiership, it was announced he had signed a two year contract extension with the club on 24 January 2012.
After breaking into the first team in the 2012-13 A-League season, Sainsbury formed a formidable partnership alongside Dutch defender Patrick Zwaanswijk which helped the Mariners secure their maiden A-League Championship against the Western Sydney Wanderers in the 2012-13 Grand Final. The Mariners won the game 2-0, which was played infront of 42,102 spectators at Sydney's Allianz Stadium. Following the game, it was speculated that Sainsbury had attracted serious interest from European clubs Southampton FC, Roda JC, FC Basel and Middlesbrough FC. Former Socceroo Mark Bosnich rated Sainsbury as his man of the match. The official award went to Daniel McBreen.
In March 2013, Sainsbury was nominated for the NAB Young Footballer of the Year which was eventually won by Marco Rojas. Sainsbury was named the Mariners Player of the Year for the 2012-13 season. He was also named in the official 2012-13 A-League Team of the Season as well as several other unofficial teams of the season.  
Sainsbury was frequently named in Football Australia's A-League Team of the Week during the 2012-13 season. He was selected 9 times during the season, with only Nikolai Topor-Stanley receiving more selections. 
Sainsbury was selected in Australia's squad for the 2011 FIFA U-20 World Cup where Australia finished bottom of their group with one draw and two losses.
As of 8 December 2013
|Central Coast Mariners||2010-11||9||0||2||-||-||-||0||0||0||9||0||2|
|Central Coast Mariners total||52||0||4||-||-||-||9||1||0||61||1||4|
With Central Coast Mariners:
- A-League Premiership: 2011-2012
- A-League Championship: 2012-2013
- NAB Young Footballer of the Year nominee: March 2013, October 2013
- Central Coast Mariners Player of the Season: 2012-13
- A-League Team of the Season: 2012-13
- Mariners’ duo to sharpen their skills at Blades Academy "Mariners' duo to sharpen their skills at Blades Academy". Central Coast Mariners. Retrieved 28 July 2010.
- "Mariners extend Sainsbury deal". FourFourTwo AU. Retrieved 24 January 2012.
- "Central Coast's Sainsbury attracting interest from Southampton, Basel, Bolton.". Yahoo Sports AU. Retrieved 25 April 2013.
- "Fox Sports' Mark Bosnich rates every player in the A-League decider between Mariners and Wanderers". Fox Sports. Retrieved 9 November 2013.
- "Sainsbury wins Mariners Medal". SBS The World Game. Retrieved 9 November 2013.
- "A-League Team of the Year - Part One - Goalkeeper and Defenders". Robbie Striker. Retrieved 9 November 2013.
- "A-League Team of the Season". Back Page Football. Retrieved 9 November 2013.
- "FourFourTwo's Team of the Season". FourFourTwo. Retrieved 9 November 2013.
- "Mariners young guns earn shot at Socceroos". Sydney Morning Herald. Retrieved 9 November 2013.
- "Socceroos name East Asian Cup squad". The Leader. Retrieved 9 November 2013.