Michael Vaughan believes the new Twenty20 Champions League tournament could dissuade counties from developing players for the England Test side.
"It is exciting, it certainly puts a lot more pressure on the county Twenty20 starting on Wednesday," the England captain explained.
"My only fear is that it will become the ultimate competition.
"Counties might start developing the Twenty20 team rather than developing the four-day team."
The two finalists in England's Twenty20 Cup competition, which starts on Wednesday with the final on 26 July, will join two teams apiece from Australia, India and South Africa in a 15-match tournament over 10 days in late September and early October, with the winners getting £2.5m.
"It would be great to have a Champions League like they do in football and have the hype around it"
Vaughan's New Zealand counterpart, Daniel Vettori, shared his hope that Test matches would remain at the forefront of world cricket.
"Test cricket for a lot of guys around the world is the most important," he said, following the Black Caps' 2-0 Test series defeat against England.
"However we still have to acknowledge that these forms of the game are coming in.
"You never hurt as much from a one-day loss, or a Twenty20 loss and you're never as elated with a win.
"[Test cricket] is my favourite part of the game and the most rewarding."
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"It sounds like a pretty good idea to me," he said. "It would be great to have a Champions League like they do in football and have the hype around it - it will be great for the game to have that sort of following.
"Any sort of tournament that can generate the incomes, profile and fan-base they are doing has to be good for the game.
"As long as the best players are out there in a competitive environment wanting to do well and wanting to perform, I'm sure the tournament will be a success."
Australia have already said their Test cricketers will not be available to participate in this year's tournament, as they will be on tour in India.
Lalit Modi, the chairman of the Indian Premier League and a vice-president of the Indian Board of Control (BCCI), said the proposed Champions League was "still a long way away" and what has been announced is "only an in-principle agreement".
"The venues have not been decided, the dates are still open and we are trying to host the event this year," Modi said.
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