The Qatar League's top scorer with 17 goals joins a lengthy injury list alongside Abdullah Koni, Mohammed Saqr, Wissam, Issa Al Kawari and Tahir Mohammed.

Al Sadd team doctor Hussain Al Menai told the club's website: "Emerson will be out for more than a month and he will have to take several physiotherapy sessions to recover from his injury."

The news will be a big blow for the 12 time Qatar League champions as it comes just 48 hours before their opening Group C match in the AFC Champions League against Al Karama in Homs.