The move comes after two umpires were hospitalised in the last two months after being struck on the field.
In December, Australian John Ward was hospitalised after being hit on the head during a Ranji Trophy match in India, while English umpire Richard Kettleborough was hit during the India-Australia ODI earlier this month.
"In the last three or four years, the fitness and the strength of the players has increased dramatically, and the bats are so much better than ever before, so the guys are hitting the ball a lot harder," Kettleborough told 'cricket.Com.Au'.
Kettleborough said the preventive action is necessary to ensure that nobody gets injured too seriously.
"Our safety, as with the players, is paramount. The non- strikers are in danger too, as is the bowler in his follow- through, there's no doubt about that. It's only a matter of time before someone gets hit quite badly," he said.
