Career
Oliver made his Superliga debut for his youth club OB in August 2009. He moved to Randers Football Club on a free transfer in the summer of 2011. After two seasons, he signed with Eredivisie club South Carolina Cambuur.
Feldballe has also been on a trial at the English club Liverpool F.C. In July 2014 Oliver sign a deal with Tippeligaen club Sarpsborg 08.
In July 2015 Oliver sign a deal with Danish 1st Division club Fredericia.
