The up and coming defender, a former AIS graduate, played for the Marconi Stallions as well as Sydney FC.
The 21-year-old is hoping for a huge season in 2010 with his new club and colours.
Oostendorp was officially presented to the club fans and sponsors at the Bonnyrigg White Eagles? season launch at the Bonnyrigg Sports Club held last Saturday.
-By Mark Stavroulakis