Haidara is a full back who joins from struggling Nancy, whilst Yanga-Mbiwa signs for 8 million euros.
Gouffran is a Bordeaux striker who will move for a fee in the region of £1.5 million, according to reports.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?