Les Violets are thought to have paid around 1.5million euros (£1m) for the services of left-back Herita Ilunga, who moves from St Etienne on a three-year deal.
However, the south-west side on Thursday sold 23-year-old stopper Lucien Aubey to Lens for a fee believed to be in the region of 2m euros (£1.4m).
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