CELTIC skipper Calum McGregor could be out with injury for between four to six weeks, it has been reported. 

The Hoops star suffered a nasty facial knock during Saturday evening's Scottish Cup victory over Alloa.

Ange Postecoglou was forced to sub off his captain at the half-way mark, as James McCarthy replaced the Scotland international. 

And the Daily Mail claim that McGregor will undergo an operation for a fractured cheekbone this week.

This could lead to him being out for well over a month. 

Giorgos Giakoumakis and Liel Abada grabbed the goals for the visitors while Conor Sammon was on target for the home side.

Celtic are on the road again this Wednesday as they travel to play Hearts in the capital.

They then host Dundee United at the weekend before a crunch derby match with Rangers next midweek.

Motherwell and Aberdeen follow, with Raith Rovers and Bodo/Glimt on the horizon in February also.