Millers manager Ronnie Moore is prepared to let Pope leave after he signed his son Ian Thomas-Moore from Tranmere yesterday for an undisclosed fee.
Vale manager Jim Gannon is short of striking options after leading scorer Marc Richards tore a thigh muscle.
Pope, a boyhood Vale fan, has scored just 6 times for the Milers in over 50 appearances and has struggled to make an impression after an injury hit couple of seasons.
Source: BBC Sport