Backrower Guido Volpi, will undertake a loan option with the Doncaster Knights in the RFU Championship in England.
The loan-agreement stipulates the Ospreys can recall Volpi at short notice but he returns to the Knights after successful loan spell last season and the move means he will get some valuable game-time.
The Argentine, who signed a new two-year deal in the summer, joined the Ospreys from French side Narbonne in the summer of 2018.