Kasey Bos

Kasey Bos (born 8 May 2004) is an Australian professional soccer player who plays as a left-back for club Excelsior Rotterdam, on loan from club Mainz 05.

Club career After playing a key role in Melbourne Victory Youth's promotion from NPL3 to the second tier of Victorian football, on 8 February 2024, Bos was elevated to Melbourne Victory's senior squad.

Bos made his A-League debut with Melbourne Victory as a substitute against the Central Coast Mariners on 25 February 2024.

In Melbourne Victory's elimination final against Melbourne City on 5 May 2024, with the Victory trailing 1–0 with less than 3 minutes of regulation time remaining, Bos assisted Nishan Velupillay's 88th-minute equalising goal, which sent the match into extra time, with the Victory eventually prevailing 3–2 in a penalty shootout.

Bos scored his debut first-team goal with Melbourne Victory in an Australia Cup match against Moreton City Excelsior on 14 September 2024, with Bos scoring the Victory's third goal in an eventual 4–0 win.

Bos scored his debut A-League goal on 1 March 2025, a last-minute 97th-minute equaliser against Brisbane Roar, which helped the Victory secure a 1-1 draw.

In June 2025, Bos signed for Bundesliga club Mainz 05 on a four-year contract. On 3 June 2026, he was loaned to Excelsior in the Netherlands for the 2026–27 season.

International career In June 2025 Bos was called up by the Australian national team for their June FIFA World Cup qualifiers against Japan and Saudi Arabia.

Personal life Bos is the younger brother of Jordan Bos of Feyenoord, whom he played alongside at Melbourne City FC Youth.

Career statistics