Though some have warned disruption could last until November, JLR described this as “speculation”.
Production lines were paused on 1 September, when the hack came to light.
The shutdown is believed to be costing the firm, which has factories in Solihull, Castle Bromwich and Halewood, an engine facility in Wolverhampton, and plants overseas, at least £50m a week.
The company has not revealed how much damage was caused, but a criminal investigation has begun.
JLR said it had delayed restarting production as “forensic investigation” of the cyber incident continued and it considered a “controlled restart” of global operations.