Boss Neil Redfearn revealed last week that the Millers had made tentative enquiries about a New York Stadium return for the 32-year-old Wembley hero, but they were waiting on answers from Cardiff.
However, with the Bluebirds now under a Football League transfer embargo, meaning they cannot recruit permanent signings in January, it remains to be seen whether that will affect their potential outgoings.
Revell, who earned himself a place in Rotherham folklore with his ambitious-but-brilliant antics at Wembley in 2014, left the Millers for a big-money move last January but has failed to establish himself in south Wales.
Reports suggested that he and fellow frontman Federico Macheda were ready to be off-loaded before news broke of their embargo last week.
Rotherham are one of a number Championship clubs who have enquired about Revell.
They are, however, primed to bolster their attacking options with an imminent move for Luciano Becchio.
