The Reds have secured a deal for the 20-year-old that will see him complete the remainder of the current campaign in Ligue 1 and move to Anfield in the summer on a long-term contract.
Jacquet, who has five caps for France U21s, has made 18 appearances for Rennes in his country's top flight so far this season.
Overall, the centre-back has figured on 31 occasions for Rennes since making his debut in January 2024. He also gained Ligue 1 experience during a loan spell with Clermont Foot.
In 2024, Jacquet helped France to the final of the U19 European Championship, during which he was named in the Team of the Tournament.
