Cash-strapped Barcelona have told Chelsea they want £21million for striker Pierre- Emerick Aubameyang.
Chelsea held talks with the LaLiga giants over the weekend and are prepared to make an offer this week but for considerably less.
Barcelona target Marcos Alonso has been discussed as part of negotiations to head in the opposite direction.
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The ex-Arsenal star has scored 11 goals in 13 starts since joining the Catalan giants in January but has now fallen down the pecking order following the club's £42.5million purchase of Robert Lewandowski.