Vice Admiral Verma is senior to Singh and was among the contenders for the top post.
Sources said Vice Admiral Verma has approached an armed forces tribunal in the national capital to know why the government ignored his seniority.
His petition is likely to be taken up Tuesday, they said
Besides Verma, the other contenders for the Navy Chief post included Vice Chief of Naval Staff Vice Admiral G Ashok Kumar, FOC-in-C of Western Naval Command Vice Admiral Ajit Kumar and FOC-in-C of Southern Naval Command Vice Admiral Anil Kumar Chawla, the source said.
While appointing the Army Chief in 2016, the government did not follow the long-held tradition of going by the seniority.
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