Given his health, salary and contract length, it's believed that no NHL teams are interested in Letang's services. He's too much of a risk, and his play has deteriorated.
Letang's unique health problems would require teams to pay an enormous amount of insurance on his contract, which they don't seem eager to do. It has long been presumed that Letang might be interested in playing with his hometown Montreal Canadiens or in Southern California, where Letang and his wife own a home.
But those teams aren't interested.