International Cricket Council chief executive Malcolm Speed has pledged to address the controversial substitute fielder rule next month.
Speed will meet with Test captains and umpires in Sydney to discuss the issue after Ricky Ponting hit out at England's use of substitutes.
"It's something we want to talk to the captains about and the umpires," Speed told BBC Five Live.
"But it's a delicate issue and a difficult issue."
Ponting was docked 75% of his match fee in the fourth Test for an angry outburst after he was run out by substitute fielder Gary Pratt.
He called England's repeated use of replacements a "disgrace" and, while he admitted it was within the rules, he added that it was "not within the spirit of the game".
Durham's Pratt was on the field to replace the injured bowler Simon Jones, but Ponting feels England have manipulated the current International Cricket Council (ICC) regulations to their own advantage.
England's bowlers have regularly left the field for short periods after spells, although coach Duncan Fletcher has insisted the breaks are merely to answer calls of nature.
Speed stressed Michael Vaughan and England had "done nothing wrong" by using substitutes during the Ashes.
"I think Ricky Ponting has a point there - we need to be careful that we keep it under control, define what's acceptable and the captains buy into that," he said.
England substitute fielders have effected more Test dismissals than any other team over the past four years.
In 52 Tests since September 2001, England subs have dismissed 18 batsmen - in contrast to four by Australia.