The 18 year-old has been a Bundesliga revelation for Werder this season, with his impact attracting interest from across Europe.
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Coulibaly has started 20 of Werder’s 28 Bundesliga games this season.
And Sky Deutschland says Chelsea have joined the likes of Manchester United and Newcastle in expressing interest in the youngster.
Germany U21 international Coulibaly joined Werder 18 months ago from Hamburg and has since thrived in Bremen.
Werder are aware of the interest and are prepared to do business - at a starting price of €50m.