Everton say "no estimation is yet being made" on how long Marouane Fellaini will be out for despite the Belgian FA saying he will be absent for three weeks.
The 24-year-old picked up a knee injury in Saturday's Barclays Premier League game against Wigan, but travelled to meet up with his national team ahead of matches against Serbia and Scotland in the coming week.
A statement on the Belgian FA's website read: "Fellaini suffered a small tear at the juncture of muscle and tendon in the knee. The injury was revealed during a scan.
"He will be out three weeks. It has been agreed with his club Everton FC he will rehabilitate in Belgium during this period."
Everton responded with a statement reading: "The Blues midfielder will miss the World Cup qualifiers against Serbia and Scotland but no estimation is yet being made on the length of his absence."
The club later confirmed Fellaini is returning to the club for further assessment of the injury and the medical team will review his scans on Monday.
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