Calum Murray to referee Old Firm clash at Ibrox
Calum Murray will referee Sunday's Old Firm derby at Ibrox.
Rangers, who have won three consecutive Scottish Premier League titles, go into the game trailing leaders Celtic by 21 points.
In Murray's last Old Firm derby he sent off three Rangers players in an ill-tempered Scottish Cup clash.
Celtic won the game in March last year, courtesy of Mark Wilson's goal. Madjid Bougherra, Steven Whittaker and El-Hadji Diouf were sent off.
A victory for Celtic at Ibrox would clinch the title for Neil Lennon's side if Motherwell fail to win at Kilmarnock on Saturday.
Both Old Firm clubs go into Sunday's derby on the back of defeats.
Celtic's hopes of securing a domestic treble were dashed in the 1-0 Scottish Communities League Cup final defeat by Kilmarnock.
The loss for Ally McCoist's men enabled Motherwell to climb level on 54 points in second place.
Rangers won the first Old Firm derby of the season with a 4-2 win at Ibrox, with Joe Ledley heading the only goal of the game in Celtic's derby win in December.