Claure said he'd hold a companywide meeting with employees on Aug. 14. While he didn't mention T-Mobile by name, he alluded to the scrapped merger plan.
"You have probably seen the many media reports speculating about Sprint's future," he said. "As I have already said, consolidating makes sense in the long term but, for now, we will focus on growing and repositioning Sprint."
Son's SoftBank Corp., which owns about 80 percent of Sprint, is counting on Claure to help return the U.S. carrier to growth. In a discussion with reporters and investors last week in Tokyo, Son said he chose Claure because of his entrepreneurial spirit.
"Marcelo, a street fighter, has enlarged Brightstar from zero to a wholesale firm crossing more than 100 countries," said Son, who acquired control of Brightstar last year. "When he came to the U.S., he had only $100 in his pocket and then he made a company with sales of 1 trillion yen. In that sense, he is the street fighter."
Claure, 43, said last week at Sprint's annual meeting that he will look at the company's costs "extensively" and that its network must improve. He joined Sprint's board in January of this year.
"During my time on the board, I was exposed to Sprint's great history of success and innovation," Claure said in the memo. "This time also provided me with deep insight into some of the challenges and opportunities we have ahead of us - and some of them are significant. The good news is we have already started working on them."
In July, Overland Park, Kan.-based Sprint reported its first quarterly profit in more than six years, with sales that topped analysts' estimates, after holding onto more subscribers than projected. Still, the company again lost monthly contract customers.
As he looks to get Sprint's house in order, Claure spent "this past weekend looking at properties in Kansas City and enrolling my children in a local school," he said in the memo. "We are ready to hit the ground running."