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According to Sky Sports News, Chelsea are chasing Lille midfielder Boubakary Soumare.
Manchester United, Arsenal, Valencia and Real Madrid are also believed to be interested in the France U21 international.
Sky Sports News claim a deal for Soumare could be done in the next week to 10 days, although Lille would prefer to keep him until after their Ligue 1 home game against PSG on January 26 if they can.
Soumare has two-and-a-half years left on his Lille contract and has impressed across 23 appearances in all competitions this season, including six in the Champions League.