LVIV, Ukraine - UEFA president Michel Platini has warned Ukraine and Poland not to allow Euro 2012 preparations to fall further behind schedule although he still has faith they can co-host a successful tournament.

At the start of a tour of Ukraine's four host cities, Platini said the stadiums in the capital, Kiev, and the western city of Lviv were far from nearing completion but UEFA was pinning its hopes on the assurances of the authorities.

"We have trusted in Ukraine for a long time already and we have trusted in Poland for a long time and we would like to see that things are moving in the right direction," he said in translated remarks.