The International Cricket Council are assessing the potential of introducing four-day and day-night Test cricket.

The chairman of the ICC, David Morgan, revealed the governing body were seriously considering the innovations as they look to increase the appeal of cricket's longest format.

"There will not be four-day Test match cricket in one year's time although we may have day-night Test cricket," Morgan told BBC World Service.

"Four-day Test match cricket is just one of many options that we are contemplating to make it the pinnacle of the sport which it has been for over a hundred years. Four-day Tests are just an option and more probable is the introduction of day-night Test cricket.

"Some Test matches finish in four days and some in five and we want as many people as possible to turn up to these matches. We want Test matches in certain countries to be more spectator-friendly.

"It is the customer and not just the player we have in mind on our quest to enrich Test match cricket which is the most demanding form of our great sport."

Last month's World Twenty20 was played to packed stadiums around England as the popularity in that form of that game continues to grow.

By contrast Test cricket in countries such as South Africa and West Indies is struggling to pull in the crowds, with the status of the game suffering a further blow in May when Windies captain Chris Gayle admitted his growing disinterest in five-day cricket.

Morgan said the views of players would also be taken into account. The demands of an already jam-packed calendar have caused some players to voice concern they are being asked to play too much cricket, and Morgan intimated four-day cricket could help alleviate those worries.

"We would only move from five-day to four-day if we considered it to be in the interests of Test match cricket," he added. "Representatives from the 10 Test playing nations are working and have been for over six months."