The star had previously filmed in Mumbai, Cuba and Dublin with Salman Khan for the project, before taking a break from the movie to work on her Shah Rukh Khan collaboration.
"I go back to India on the 27th and will start shooting again for Ek Tha Tiger," Kaif told Digital Spy.
Before leaving for Mumbai, the actress will complete her final day of filming on the current schedule of Yash Chopra's film, at an indoor location in East London.
Kaif said that she would be leaving directly from the shoot to attend a fundraising event in High Wycombe on Saturday evening, where her 2011 release Zindagi Na Milegi Dobara will be screened.
Speaking about her outfit for the event, the actor stated: "Actually I think it is going to be whatever I am wearing on set for the film that day, because I'll be coming straight after pack up of the shoot."
Watch the Ek Tha Tiger digital poster below: