Coleman, who holds the year’s fastest time of 9.81 seconds, faces an arbitration hearing next month ahead of the world championships, which begins in Doha on 28 September.
Veteran paceman Lasith Malinga has been retained captain in the shortest format with Sri Lanka Cricket naming a 15-man squad for the series starting 1 September in Kandy.
Dyantyi has requested that a 'B' sample be tested after he had a urine sample return positive for a banned substance on 14 August by the South African Institute for Drug-Free Sport.
A year on from the tense decider won 6-2 6-4 by Naomi Osaka, opinion remains deeply divided over how Ramos handled the match and the heated exchanges with Williams.
A swathe of absentees leaves the door open for a first-time winner and a South American clean sweep of Grand Tour victories this season as the Vuelta a Espana begins on Saturday.