Japan's SoftBank Corp. is in talks to acquire U.S. wireless carrier T-Mobile US Inc. and is discussing funding for a deal with financial institutions, sources close to the matter said on Wednesday.

SoftBank is talking with T-Mobile parent Deutsche Telekom AG and hopes to take a majority stake in T-Mobile through its recently acquired U.S. subsidiary Sprint Corp. in the financial year starting next April, one of the sources said.

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The Nikkei business daily reported on Wednesday that SoftBank was in the final stages of talks with Deutsche Telekom about acquiring T-Mobile, the No. 4 U.S. wireless service provider.

Experts have said that a deal between Sprint and T-Mobile could face close scrutiny from U.S. regulators due to concerns about market concentration.