John took to micro-blogging website Twitter to announce the date on Tuesday.
"'Welcome Back' releases 4th September! Watch this space for more. @ErosNow," the "Dostana" actor tweeted.
Anil, who was also part of the first instalment of the franchise, wrote: "We're all set to tickle your funny bones on the 4th of Sept. Get set for hilarity with #WelcomeBack @ErosNow."
Directed by Anees Bazmee, "Welcome Back", which is the sequel to the 2007 comedy, also stars Shruti Haasan and Nana Patekar.