Ravichandran Ashwin has aired his irritation with umpire calls in the Indian Premier League after Rajasthan Royals' three-run win over Chennai Super Kings.

Jos Buttler's unbeaten half-century in the first innings was enough to help the Royals hold off a dramatic late CSK rally led by MS Dhoni and Ravindra Jadeja.

But the decision was made by umpires Virender Sharma and Vinod Seshan to change the ball in the 12th over of the hosts' losing chase.

Though the officials are within the laws of the game to do so, Ashwin acknowledged he was frustrated by the move after the Royals did not ask for it to be swapped.

"I'm quite surprised the umpires changed the ball for dew on their own," he said. "It's never happened before and I'm quite surprised.

"Some of the decisions in this year's IPL on the field have left me a little flummoxed, to be honest. It left me flummoxed in a good or bad way because what you need is a little bit of balance.

"We're going as a bowling team and we're not asking for the ball to be changed. But the ball was changed on the umpire's accord. I did ask the umpire, but he said we can change it.

"So I hope every time there's dew they can change it every single time going forward in this IPL. You can do whatever you want, but you need to be standard."

Ashwin is not the first player to criticise the decision-making process by umpires, with Punjab Kings' Sam Curran voicing his displeasure over ball changes.

The Royals are currently top of the IPL standings, having picked up three wins from their first four games this season.