The 19-year-old defender has signed a one-year deal, with a one-year extension option for the club, and he will initially link up with Simon Rusk’s under-23 squad.
Rusk commented, “We are pleased to have completed the signing and are delighted to welcome Romaric to the club.
“He is another player the club has been aware of for a period of time. He is a versatile player and is comfortable at right-back, on the right wing or as a wing back.
“He is a talented player who has great potential, and I look forward to working with him."
Yapi began his career in the French capital with PSG, and over the last two seasons has made nine appearances in the UEFA Youth League.