That indicates he is a pre diabetic.
He doesn't need to take anti-diabetic medications if he is not on one but take dietary precautions which includes a low
sugar diet avoiding processed sugar as much as possible and also excercise for atleast 30minutes a day. Excercise may include 30min brisk walk.
If he is already on anti-diabetic medication kindly do not panic, the dose has to be altered a bit and he'll be able to maintain fasting sugar below 100 again.