The Senegalese striker had flown to Germany after Bayern agreed a season-long loan with Chelsea, including an option to buy in a deal worth £69 million (€80m/$93.5m).
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However, Chelsea informed the Bavarian club that the move was off following Liam Delap’s hamstring injury in Saturday’s 2-0 Premier League win over Fulham.
Chelsea return to action on September 13 after the international break with a crucial Premier League trip to Brentford.