The announcement comes after remarks from UEFA president, Michel Platini, on Saturday that the tournament could be abandoned if stadiums in Warsaw and Kiev were not ready on time.
"The plan we have accepted and which was accepted by UEFA will be carefully fulfilled by the Polish side," Prime Minister Donald Tusk told a joint news conference with Platini. "We guarantee we will deliver on these investments, including the stadium in Warsaw, in line with the schedule," Tusk said.
Platini, who also met Polish Football Association (PZPN) officials and Sports Minister Miroslaw Drzewiecki, made no comment during the news conference. He is due to visit Kiev on Thursday.
Both Poland and Ukraine face major infrastructure problems which include a lack of stadiums and modernisation of airports, road and rail networks.
UEFA has repeatedly denied it has a contingency plan for the tournament. Platini said last weekend that UEFA would take its final decision on the hosting of Euro 2012 in September.
