Paul Sturrock will have to do without his captain after the gamble to play his against Cardiff last weekend failed to pay off.
Sturrock told the club's official website: "Duguid's out for between four and six weeks. I took a wee chance on him on Saturday after he had a niggling knock for two or three days.
"It will be a blow because he is the captain of the team and has shown an amazing standard of performance for not playing very often in the centre of midfield. We are going to miss him."