The son of Southampton boss Ronald Koeman is making his way in Dutch football.
Ronald Jr is a goalkeeper and has just moved to FC Oss from Almere City FC.
The 20 year-old stated: "I have a very good feeling about this club. The mutual contact has always been pleasant and I think I can grow as a goalkeeper. I know the other two goalkeepers in the club and join to fight for a place under the crossbar."
FC Oss chief Peter Bijvelds added: "Ronald has indicated that he wants to continue his career in a new environment. I think we can offer him this environment.
"He will enter this competition with Nick Hengelman and Xavier Mous."