By Matthew Cowley and Rogerio Jelmayer 

SÃO PAULO--The board of directors at Brazil's largest phone company Oi SA has approved a financial appraisal of Portugal Telecom SGPS SA as the two companies seek to move forward with a merger questioned by some minority shareholders.

Banco Santander (Brasil) SA estimated that Portugal Telecom is worth EUR1.75 billion, which is in line with the estimate used in the initial Oct. 1 merger agreement, Oi's directors said in minutes of a board meeting held Wednesday.

The value of the PT assets will be used to calculate how much its shareholders will own of the new company. As part of the merger, Oi expects to increase its capital by about 14.1 billion Brazilian reais ($5.9 billion), of which at least 7 billion Brazilian reais and as much as 8 billion reais will be in fresh cash and the remainder will be from the inclusion of the PT assets.

The merger is expected to close in the first half of this year and would create a new Brazil-based company with annual revenues of around 38 billion Brazilian reais ($16.2 billion) and more than 100 million subscribers across three continents. It would also streamline a complicated shareholding structure, and leave PT shareholders with about 38% of the new company once the merger has been completed, according to merger documents.

One board member, Antonio Cardoso dos Santos, voted against the appraisal, according to the minutes.

The board of directors has called a shareholder meeting to examine the appraisal March 27.

The original Oct. 1 valuation has been criticized by some minority shareholders of Oi who claim the Portuguese company is worth less, and that as a result Portugal Telecom shareholders are benefiting unduly. They also claim Oi's majority shareholders stand to gain more from the transaction because the new company will take over responsibility for paying back their debts.

The minority shareholders won some preliminary support from Brazil's securities and exchange regulator, the CVM. In January, one of the CVM's departments recommended that Oi's majority shareholders abstain from voting on the financial appraisal to avoid a conflict of interest.

Domenica Noronha of Rio de Janeiro-based asset manager Tempo Capital Gestão de Recursos--and a minority shareholder of Oi--said she will await publication of the full financial appraisal before deciding what course of action to take. Nonetheless, she said the decision by the majority shareholders on the board of directors to vote to approve the appraisal already goes against the CVM department's advice.

In Lisbon, shares in PT ended down 2.71% at 3.23 euros Thursday, according to the Lisbon stock exchange's website. The firm's shares traded at 3.40 euros the day before the merger.

Oi's shares traded in São Paulo ended 0.3% at BRL3.77, in line with broader market. The shares traded at BRL4.22 the day before the deal was announced in October.

"Despite the expectation that the minority shareholders will challenge [the appraisal], I think the operation will go through," said Alexandre Montes, a telecommunications analyst at Lopes Filho Consultores in Rio de Janeiro. "This is a question of survival for Oi, there's no plan B. The company is highly indebted and is falling behind the competition."

Write to Matthew Cowley at matthew.cowley@wsj.com and Rogerio Jelmayer at rogerio.jelmayer@wsj.com

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