The review comes just five months after the agency was awarded the business following a pitch against JWT, DCH and Joshua G2. The incumbent CHI & Partners declined to repitch.
It is believed that the breakdown in the relationship was a dispute over fees.
In April, Grey unveiled the first major campaign for 888.com since its appointment. It was a marketing push for its female-targeted bingo site 888.ladies.com.
The TV ads consisted of two 60-second spots and two 30- second executions, all of which feature comedy characters, or “Bingo Superstars”, that develop delusions of grandeur after winning at bingo.
Prior to Grey, CHI & Partners was awarded the ad account in October 2007, charged with launching a branding campaign, at the time thought to be worth up to £6m.
CHI was appointed to the business following the introduction of the Gambling Act which saw the deregulation of gambling advertising.