With stability now established in both the managerial and boardroom structures, the Ligue 1 side are already shaping their squad for the upcoming campaign.
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Hainaut currently plays for Venezia FC in Serie B and he enjoyed an impressive season, making 37 appearances, scoring five goals and providing six assists.
His contributions played a key role in helping Venezia finish top of the table and secure promotion back to Serie A.
The 24-year-old who is valued at around €10 million, was previously linked with moves to Angers and Auxerre last summer, but Rennes are now among the clubs considering a formal approach.