Jeffrey Wenninger claimed the 69-year-old "Tiny Dancer" singer inappropriately touched him several times throughout the course of his employment in 2014, reported TMZ.
In another alleged incident, Wenninger accused the musician of saying, "You gorgeous thing, you."
Wenninger, who quit his post in September, 2014, claimed he repeatedly attempted to verbally and physically resist the singer's alleged advances, but to no avail.
The former security guard is suing for sexual harassment and battery.
Representatives for John have yet to respond to the lawsuit.