The Turkish forward has agreed to a move to the Route de Lorient after finding himself on the fringes of the action at the cash-rich French capital club
The Turkey international will undergo a medical with Rennes on Wednesday after the two clubs concurred on an €8 million deal.
Erding, who joined PSG from Sochaux in 2009, has seen first-team opportunities very limited at the Parc des Princes in recent times, making just six starting appearances to date this season.
The 24-year-old striker turned down an €8.5m move to Newcastle in the summer after failing to agree personal terms with the Premier League side, despite both clubs reaching an agreement.
Rennes sit fifth in the Ligue 1 table, eight points adrift of leaders PSG, and host Olympique de Marseille in this weekend's match.
How do you stay up to date with football when on the move? With http://m.goal.com – your best source for mobile coverage of the beautiful game.