Weekly release of courses to learners

Short: I'm trying to find a way to automatically release one course per week to a group of learners. 

Longer: I have a new group of learners every week. Learners must complete 10 courses; one per week. I could create a learning path and set a completion date for each course, but that would release all learning in one go. What I would like to do is for the learners to access just one course per week for the ten weeks/courses.

Any ideas on how I could do that?

Many thanks!