The 26-year-old departs by mutual consent after just 16 appearances in his single season with the Pilgrims.
"Rene is now free to find himself another club and advance his career away from Home Park," a club statement said.
The Irishman arrived from Watford last summer, but has not featured since the 0-0 draw with Accrington in January.
And with manager John Sheridan having signed former Oxford goalkeeper Luke McCormick to compete with Jake Cole the keeper is heading to pastures new.
- Sports & Recreation