Drogba in particular has been in good form for Gala this season and he scored when the two sides played out a 2-2 draw in Turin back in October.
Juventus must avoid defeat in Istanbul to stand any chance of reaching the knockout stages of the Champions League, but Conte has conceded that Drogba and Dutch international Sneijder could have a big say on the outcome.
"The likes of Drogba and Sneijder are always dangerous. We'll have to be on our guard throughout," he told reporters.
The two players joined Gala in January of this year.