In August 2018, the Western Melbourne Group was one of the eight teams that the FFA had accepted in the official bidding phase, as part of the new expansion process.

[5] Western Melbourne will play its home games at Kardinia Park in Geelong for its first two seasons, while it builds its stadium and training centre in Tarneit, with completion expected in 2021.

On 11 January 2019, Western Melbourne Group announced John Anastasiadis as senior assistant coach for the club's debut season.

[14] On 2 June 2019 the Director of Football for Western United, Steve Horvat presented Geelong representative players with their kits for the 2019 Country Championships.

[16][17] The 2023-24 A-League season started promisingly for Western United, with the club recording a 2-1 win over Melbourne City at AAMI Park.

The club commented that the design was influenced by the pitch of roofs in the suburbs and the West Gate Bridge, with the signature green colour representing growth, harmony and freshness.

[21] On 18 June 2019, through consulting with Kappa and fans, the club officially unveiled its inaugural home and alternative kits for the 2019–20 A-League season.

The home kit consists of green and black vertical stripes where the Western United logo is encased in a faint crest.

The alternative kit takes a different approach with a geometric design with varying sized green and black triangles connecting each other through their points.

[22] On 20 May 2019, Western United announced a partnership with Italian sports brand Kappa, which will be the club's inaugural official apparel partner.

[23] Western United announced Probuild as its inaugural sponsor on 3 July 2019 where its logo will be present on the front of its playing kits as well as other apparel.

This groundbreaking partnership will focus on football and player development while also giving chances to promising talents overseas through a range of collaborative initiatives.

Both clubs will share access to state-of-the-art training facilities for various programs such as pre-season friendly matches and walking football clinics.

[29] It is planned that the two grass pitches will be occupied by Western United A-Leagues teams throughout the year while the third, synthetic field will be utilised by the club's academy and community engagement activities.

[30] Upon their entrance to the A-League, Western United initially used the City Vista Recreation Reserve, the home ground of Caroline Springs George Cross FC as their training base.

[37] The proposal, to be funded entirely privately, has received planning approval from the Victorian Government, and the club has stated it expects construction to commence in mid-2024 with a view to completion by mid-2026.

Western United chairman Jason Sourasis stated that construction should begin mid-to-late 2024, with completion in time for the 2026-27 A League season.

[68] Elimination finals--> Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.