Gayle, 31, has been involved in a protracted dispute with the West Indies Cricket Board and has not turned out for the team since he played in a World Cup quarterfinal against Pakistan in Dhaka on March 23.
The left-handed Gayle, who will join the Dolphins next February, is regarded as one of the most devastating batsmen in world cricket and has scored 6,373 runs in his 91 Test matches, while he has accumulated 8,087 runs in 228 ODIs.
In the 20 T20 internationals he has played, Gayle has bludgeoned 617 runs at a strike-rate of 144.49 and he is one of only five men to have scored a T20 international century.
