The 27-year-old forward is confident that his side will have enough time to prepare for the opening Euro match against Joachim Low's men on June 9 in Lviv
Die Mannschaft sent Portugal packing at Euro 2008 and are one of the favorites in Poland and Ukraine, but Ronaldo refused to write off the Seleccao's chances against Joachim Low's men in the first group game.
"I am looking forward to the tournament, we will have a few days to prepare for it," Ronaldo said.
"The coach knows better than anyone what to do. We will have 20 days to prepare for the first game, so we will have enough time to set up the tactics to beat Germany."
After the match against Germany on June 9, Portugal will take on Denmark (June 13) and Netherlands (June 17).
The Euro 2004 runnerup, whose pre-Euro training base is located in Obidos, will play friendlies against Macedonia and Turkey before flying out to Opalenica, in Poland.