Barca, who missed out on a number of attacking targets during the summer, have already been linked with a string of high-profile replacements in recent days.
Bartomeu believes that Dembele is on course to be back up and running for the start of 2018, however, meaning that the club's transfer plans have not altered.
"There are no plans for the winter market," he told TVE. "[Dembele] will be back and he will show us all what we have already seen."
Philippe Coutinho was a long-term target for Barcelona during the summer months, while Liverpool teammate Sadio Mane and Paris Saint-Germain attacker Angel di Maria have also been touted as possible targets.