Team vice captain Gilchrist, whose record-breaking 149 led Australia to their fourth title in the Caribbean, said he used the squash ball in one of his gloves to give him a better grip.
"It's a storm in a teacup, or a batting glove," Cricket Australia spokesman Peter Young said Tuesday.
"To the best of our knowledge it's no different to, say, putting two or three grips on the bat handle, or batting with two pairs of gloves or having inserts sewn into the palm of gloves.
"All these are things which now happen.
This is in the same category."
The revelation caused uproar in Sri Lanka, with Sri Lanka Cricket secretary Kangadaran Mathivanan saying the matter could be taken up during next month's International Cricket Council (ICC) annual general meeting.
"We are of the opinion that it was unethical for Gilchrist to use a squash ball to give unfair advantage," Mathivanan told AFP Monday.
He said Sri Lanka could call on the ICC's cricket committee for stringent application o