Celtic captain Scott Brown may not play again until the festive period because of a metatarsal injury.
It had previously been estimated that the 25-year-old former Hibernian midfielder would only be sidelined for six weeks.
However, a brief statement on the Bhoys' official website read: "Following a visit to see a specialist, it has been confirmed that Scott Brown will not require surgery on his injury.
"The Celtic captain has suffered a stress reaction in the third metatarsal on his right foot. However, with the extra rehabilitation work required, the midfielder is likely to be out for between eight to ten weeks.