Platini was wrapping up a two day visit to Poland and Ukraine with a UEFA delegation to inspect the countries' progress with the construction of stadiums, transport and other infrastructure for the major European soccer event.
Poland and Ukraine were chosen to co-host the tournament in 2007, but in January UEFA expressed its dissatisfaction with the start the countries had made getting ready for the event.
At a meeting with Ukraine's Prime Minister Yulia Tymoshenko, Platini said the responsibility lay both with the host countries and UEFA, but added that the current situation did not meet his expectations.
Tymoshenko assured the UEFA president that Ukraine would do everything possible to make Euro 2012 a true holiday for the world of soccer.
Platini said Wednesday that the results of the meetings and inspections in Poland and Ukraine would go into a report to be discussed at a UEFA meeting in the fall.
"A report will then be given to the UEFA Executive Committee in order that they can fully review the situation in the two countries at our next meeting on 25 and 26 September in Bordeaux," Platini said.
Before the Euro 2008 final last weekend, he denied that there were plans to move the tournament. Media reports have suggested Scotland was eager to host the event in case Poland and Ukraine drop out, while Italy and Spain have also been mentioned as possible replacements.