Microgaming, which previously worked only with US-based Lotus PR, wants to bring its comms function closer to its Isle of Man base.
Its software is used for 160 casino and poker sites, including River Belle and 32 Red.
'The online gaming business is a rapidly growing market and we'll look to establish Microgaming in new markets,' said Chameleon head of consumer Stuart Hehir. 'We'll also broaden awareness to a wider audience, such as national business writers.'
Chameleon will co-ordinate a network of agencies to run the account, including Lotus in the US and Fulford PR in Singapore.
Chameleon also works with Lotus on its account with eCOGRA, the online gaming industry's standards authority.
Hehir reports to Microgaming marketing director Gavin Bisdee.