The Bulls' match against Port Vale on Boxing Day has been brought forward to a 1.30pm kick-off.
The club report the move is on Police advice.
Meanwhile, trialist Sam Hart is reported to still be with the club. The 19 year old left back is currently a first year pro with Preston but has not yet made his first team debut. He played in the friendly match against Glenn Hoddle's Academy side two weeks ago, and is a Welsh u19 international.