UEFA is to discuss the possibility of expanding the European Championship finals at its Congress in Croatia later this month.
UEFA said that it would present the report to delegates during the January 31 meeting in Zagreb.
UEFA spokesman William Gaillard said various models had been considered up to a maximum of 24 teams.
“They have looked at different numbers and the overall effect of making such changes, including the possible effect on the qualifying round,” Gaillard said.
“By expanding the number of teams in the final competition you could actually make the qualifying tournament less interesting so all these factors have to be taken into account.”
UEFA have already said that any changes to the tournament’s format will not be made until the 2016 competition at the earliest.