Australia midfielder Dario Vidosic has agreed to join Swiss club Sion from Adelaide United.

Adelaide announced on its website Monday that it agreed the transfer with Sion, which has failed to score in its first six games of the Swiss league season.

Vidosic says in the club statement that he's ''a bit sad leaving'' but that ''this is a great opportunity that I couldn't knock back.''

Details of the transfer deal were not disclosed.

The 26-year-old Vidosic spent four seasons playing in Germany before joining Adelaide in 2011.

Born in Croatia, the attacking midfielder played in two World Cup qualifiers as Australia advanced to the tournament in Brazil.