The food company has contacted a number of agencies ahead of a pitch for the business, which is currently handled by Skive.
Skive created Aero's recent social media campaign "AeroMail", which aimed to raise awareness of the new Aero bar.
AeroMail allowed consumers to "spread the bubbliness" by sending an uplifting message to their friends using a digital balloon on Facebook. Each message generated a sample bar.
Other agencies that work on Aero include JWT London and DDFH&B.
Last year, Nestle unveiled a £4 million advertising campaign, created by DDFH&B, to support the launch of an Aero-branded biscuit that was aimed at women.
In January 2011, Nestle reintroduced its Aero Caramel brand with a claimed new and improved recipe. It was supported by a campaign called "bubble-speak", which was also created by DDFH&B.
JWT created the 2009 "feel the bubbles" spot in which a skateboarder navigates a sea of bubbles. The agency is unaffected by the digital review.