ESPN reports that the Yankees have sent a letter to Robinson Cano, asking him to cease his participation in winter ball. He had been playing for the Estrellas Orientales. Their general manager, Alfredo Griffin, said that the Yankees didn't offer much in the way of reasons, but the report notes that Cano told his teammates that the Yanks didn't want him to re-injure a calf injury that is still on the mend.