Khan, along with Sri Lankan-born Jacqueline Fernandez and five other Bollywood performers are set to appear on stage in support of Rajapaksa.
This is the first time a Bollywood actor has been roped in for a poll campaign, analysts said. Beset by mass defections from his ruling coalition to the opposition challenger Maithripala Sirisena, Rajapaksa is believed to have suffered a loss of popular support.
The Bollywood stars are expected to boost the sagging morale of the incumbent's campaign. Khan is not the only Indian influence in the Rajapaksa campaign.
The presidential election will take place on January 8 as Rajapaksa called the election two years ahead of schedule in an apparent attempt to seek fresh mandate before his party's popularity tumbles further, after dropping over 21 per cent in September local elections.
Hitting out at Bollywood actor Salman Khan for allegedly campaigning for Sri Lankan President Mahinda Rajapaksa, MDMK chief Vaiko today dubbed him as a 'betrayer.'
"He is also a betrayer," Vaiko told reporters here when asked about this.