The 25-year-old, who joined Chelsea from FC Porto over the summer, managed just 20 minutes against Chinese Super League side Guangzhou Pharmaceutical before complaining of a thigh complaint.

He underwent a scan in Macau on Friday evening and the decision was made to send the Portugal international back to Chelsea's Cobham training ground for treatment.

Bosingwa now faces a race against time to be fit for the Barclays Premier League opener against Portsmouth at Stamford Bridge on 17th August after suffering the tear, which is being described as "minor" by Chelsea.

railway cup

Paulo Ferreira stepped into the right-back role in Saturday's 7-0 win over Chengdu Blades.

Meanwhile, following England's exit from the UEFA European Under-19 Championships, Scott Sinclair has joined up with the squad.

Sinclair, 19, had spells on loan with Queens Park Rangers, Charlton Athletic and Crystal Palace last season.

Chelsea complete their three-match Asian tour against a Malaysia Select XI in Kuala Lumpur on Tuesday before travelling to Moscow to face Lokomotiv Moscow and AC Milan or Sevilla in the Railway Cup.