"To have the top two run-scorers in the history of the World T20 walking out into the middle at Taunton is something that I hope the members and supporters will be looking forward to," Somerset director of cricket Matt Maynard said in a statement.
Gayle, 36, who will play in the World Twenty20 semi-final against India later on Thursday, said in January, he would return for six Somerset matches this year after scoring 328 runs in three appearances for them last term.
Somerset failed to make the knockout stages of last year's NatWest T20 Blast, which was won by Lancashire Lightning.
(Writing by Patrick Johnston in Singapore; Editing by John O'Brien)
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