Gornell, who is on loan with Dale from npower League One side Shrewsbury, was dismissed in the closing stages of the 3-2 loss against Exeter for kicking out at Kevin Amankwaah.
The striker had already struck a brace, taking his tally to three in as many games, to give his side hope in that contest after extending his stay at Spotland until January just 24 hours before kick-off.
However, Dale boss John Coleman must now consider alternative options up front with Dele Adebola, an unused substitute against the Grecians, perhaps primed for a start.
There is better news elsewhere for Coleman, though, as defender Kevin McIntyre returns from a one-game suspension having accrued five cautions.
Midfielder Reece Gray has continued with his light training but is still some way off returning from his broken leg.