The UEFA president has said he wants to make changes to the transfer system in a bid to prevent big clubs from hoarding all the best players.
Speaking to a conference in Lisbon, Aleksander Ceferin, president of football’s governing body in Europe, said a "luxury tax" and squad limits were needed to stop rich clubs dominating the game.
The "excessive concentration of talent with a few teams" needed to change, he said, adding, "Uefa has a duty to protect the whole of football and not just the elite."
Ceferin, a Slovenian lawyer, was elected last September.
"We need to assess whether the transfer market is the best we can do. We cannot be afraid to touch it. We do have to examine new mechanisms like luxury taxes and in particular sporting criteria like squad limitations and fair transfer rules, to avoid player hoarding," he said.
Although he gave no details about how to carry out his proposals, Ceferin said that Uefa could work together with Fifa to change the transfer market.
European clubs and leagues are unhappy about big teams signing their best young talent, and then farming them out on loan.
Premier League leaders Chelsea currently have around 30 players out on loan, while Italian champions Juventus have more than 50 players on loan at different clubs.
The suggestions were among a raft of ideas from Ceferin that he said would help to tackle problems affecting the game, including doping, corruption, violence and match-fixing.