Defender McLean to miss most of Motherwell's season
The 23 year old was carried off with a knee problem following a strong challenge by CFR Cluj defender Diego Ruiz during Motherwell's 2-1 friendly defeat by the Romanian champions on Thursday.
"The defender has partially ruptured his cruciate ligament and torn his medial ligament," said the .
"He also has a small fracture on the outside of his knee."
The former Rangers defender was out for eight months after damaging his cruciate ligament in September 2006.