The 21-year-old Australian, who was released by Liverpool last summer, made his Latics debut in March after Alex Cisak was injured and kept his place during the run-in.
Manager Paul Dickov told the club's official website: "When Dean came in it was on non-contract terms and he was not paid initially.
"He worked hard and was rewarded with a deal until the end of the season.
"Dean had to wait patiently for his chance but, when it came, he seized it."


 





