By Rogerio Jelmayer

SÃO PAULO--Brazilian telephone company Oi SA (OIBR4.BR) will put its controlling stake in Africatel Holdings B.V. up for sale as part of the company's effort to raise cash to make an offer to try to acquire TIM Participacoes SA, the Brazilian mobile phone company controlled by Telecom Italia SpA.

Oi said late Tuesday that its board authorized the company's management to take the necessary measures for the sale of Oi's holdings in Africatel Holdings, representing 75% of the capital stock of Africatel.

Oi also faces a dispute with the minority shareholder of Africatel, called Samba Luxco, which informed Oi that it planned to exercise an option to sell its 25% stake in Africatel shares.

"Oi will lead the sale process even though Oi believes that it is in the interest of both shareholders of Africatel to maximize the value of their investments that such a sale is executed in a coordinated manner with Samba Luxco S.a.r.l, an affiliate of Helios Investors L.P., which holds the remaining 25% of the capital stock of Africatel," Oi said.

Oi is also committed to work with its local partners in each of the operating companies in which Africatel has invested to ensure a coordinated transition of ownership, it added.

The sale process comes amid Oi's efforts to attract local rivals to help in buying and splitting up TIM Participacoes SA, according to two people familiar with the plan.

In August, Oi said it hired investment bank BTG Pactual to arrange a deal, involved a possible acquisition of TIM Participacoes. Then, a source close to the talks said that bank had contacted Telefónica Brasil SA and Claro, the local unit of Mexico's America Movil SAB, for a potential deal, since Oi can't acquire TIM alone because of antitrust issues.

TIM has a market value of more than 30 billion Brazilian reais ($12.8 billion). Oi is already deeply in debt and plans to sell noncore business assets to help finance the purchase, including telecommunication towers in Brazil, some properties, and assets in Africa that could be worth as much as $1.77 billion, said another person with knowledge of Oi plans.

Write to Rogerio Jelmayer at rogerio.jelmayer@wsj.com

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