Since arriving at Ibrox in the summer, the Brazilian has had terrible luck with injuries.
After sustaining a face injury that required him to wear a mask while playing, he will be out until April due to a ligament problem.
When healthy, the 24-year-old had established himself as the top option and had already scored four goals this year.
It is unclear whether the team will be able to sign a successor in January despite reports that other possibilities are being explored.
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