Quoting two people familiar with talks between the parties, Bloomberg reports that the company, which Altice has promised to divest as part of its acquisition of telecom assets in Portugal, is worth around €300 million.
It adds that talks about the possible sale of Cabovisão could go on for several months.
Vodafone is already active in Portugal, expanding its network to offer bundles of fixed and mobile services, including broadband and TV.
Significantly, its CEO Vittorio Colao said last year that the company was interested in acquiring cable assets in Portugal.
Under the terms of its €7.4 billion deal to buy the Portuguese assets of Portugal Telecom last year, Altice was required by the regulators to sell both Cabovisão and ONI.
Just this week, the European Commission gave the go-ahead to Altice/Portugal Telecom deal.
Cabovisão was acquired by Altice from Canada’s Cogeco Cable for €45 million in March 2012.