Actor Rajinikanth today hinted at a rethink on joining politics and said he would announce his stand at an "appropriate time" amid speculation triggered by a letter that many believed was written by him and leaked. "The letter is not mine but the information on my health and doctors' advice is true," Rajinikanth said in a statement. "I shall discuss with Rajini Makkal Mandram and shall announce my political stand at an appropriate time," said the 69-year-old actor, who has weighed in on various political issues but has delayed his formal plunge.