Kasey Bos

According to available data from June 2026, the player's market value is estimated at €450,000 by Transfermarkt. This follows his transfer from Melbourne Victory to FSV Mainz 05 in July 2025 for a reported fee of €500,000. At the time of that move in June 2025, his market value was also cited as €450,000.

Our valuation is driven by the recent €500,000 transfer fee paid by FSV Mainz 05 for Kasey Bos in July 2025. This figure is supported by a consistent Transfermarkt valuation of €450,000. While his progress was hampered by injury, a loan to the Eredivisie suggests his value has remained stable as he seeks to prove himself at a higher level.