Mavinga is due in France to undergo a medical and thrash out personal terms with the Ligue 1 outfit.
The France Under-20 international believes he has made the right decision to leave Liverpool in order to find regular first-team football at a crucial stage of his development.
He told France Football: "Indeed, I will be at Rennes early this week. I have been in contact with the club since mid-June and I now need to have medical examinations and sign a contract.
"Why don't I try and make a name for myself at Liverpool? Firstly, I only have one year remaining on my contract at Liverpool. Secondly, because I am 20 years old, I want to become established at a club. I don't want to play one season and then leave.
"I am now going to take in my fourth club and it is the right time for me to start planning long-term.
"I learnt a lot at Liverpool, most notably about attitude. There I understood that you have to be 100 per cent in matches and in training sessions.
"I don't regret any choices I have made in my career so far. I hope things will continue to progress at Rennes."