Somerset won the third Twenty20 Cup competition

After its worldwide success at domestic level, a Twenty20 World Cup is planned for 2009, with an invitational tournament set to take place next year.

"If suddenly we start playing too much international Twenty20 cricket I think people will drift away from the domestic game," Fraser told the BBC.

"And the money counties have been able to generate will suddenly disappear."

The UK is in line to host the inaugural Twenty20 World Championship in three years time, with eight teams playing over nine days at two venues.

More: England delight at World Cup planning

But Fraser added: "I would like to see, in England, it played as it is this summer, which is one tour-opening match against Sri Lanka and another against Pakistan."

The Twenty20 Cup was launched in 2003 and has revived flagging county spectator figures.

An average of approximately 7,000 fans attended each group game last summer, up from 6,100 the previous year.

England staged its first Twenty20 international in July, beating Australia at the Rose Bowl, and matches have since been staged in Australia, New Zealand and South Africa.

Former England and Wales Cricket Board marketing man Stuart Robertson played a large part in launching the format.

He told the BBC Radio Five Live's Simon Mayo programme administrators must "remember why Twenty20 was brought in in the first place.

"That was to meet a specific need at domestic level."

He explained: "We had seen huge fall-offs in attendances across county cricket.

"After a huge piece of research we found that people would come back to the game if it was played in a more manageable format.

"The international developments have been a spin-off from that but at its core it was to meet a specific need."