The 30-year-old, who scored eight times in the Barclays Premier League last season, has been linked with a transfer away from Stamford Bridge this summer although the Blues claim his absence from the trip is due to the need to recover from a knee injury.
Drogba´s omission seems certain to raise further questions about his future, however, with a virtually full-strength squad travelling to play games in China and Malaysia before returning to Europe for the Railways Cup in Moscow.
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