Do-Heon Kim was forced off during West Brom's 1-0 win at Middlesbrough yesterday. The South Korea attacker fell to the ground unchallenged in the first minute and was stretchered off.
Baggies boss Tony Mowbray said: "He needs to go and get a scan but our doctor thinks the minimum is his medial knee ligaments, which is six weeks out. And it could be worse than that."