Uefa president Michel Platini says he is considering making teams from Italy, England and Spain play each other to qualify for the Champions League.
Platini suggested that Europe's major leagues' lowest-placed qualifiers were finding it too easy to qualify.
"It's not about disturbing England, Italy or Spain, but about finding a balance, Platini said.
"Perhaps teams from bigger countries, who have four and three qualifying teams, should play against each other."
Platini added: "My problem is that the two English, Spanish and Italian teams in the final qualifying round do not play against each other, they play against smaller teams.
"We want to add some of the other countries to the competition and to do that we have take some of the others away.
"I'm not sure that the fourth clubs from Spain, Italy and England are more important than the champions of Poland, the Czech Republic and Denmark."
Any changes to the format would not come into force until the 2009-10 season.
Platini also wants to ban players going on loan to teams playing in the same competitions as the club that owns them.
"If a player is on loan at one club it is logical for me that he is excluded in playing in the same competition as the club who owns him," said Platini.
"He should not be able to play in the same league as his own club."
The issue has come to the fore in recent weeks over Chelsea's connection with Brazilian defender Alex, who is currently at Dutch side PSV Eindhoven.
The clubs could face each other in the Champions League semi-final but Chelsea say there are no eligibility issues because the player is not on loan at PSV, merely that they have an option to sign him.