The 31-year-old rejoined his boyhood club on a full transfer after a disappointing spell at Spanish side Espanyol.
"On the plane coming over I was thinking that the disappointment of Spain will give me extra motivation," Nakamura told reporters on being unveiled as a Yokohama player.
"The World Cup was the main reason. I need to be playing regularly. Not playing before a World Cup was a risk. But I have no regrets about going to Spain."
Japan's mercurial midfielder snubbed Yokohama to join Espanyol last June but spent long periods on the bench at the Barcelona-based club.
"I hope to use my experience to Yokohama's benefit," said Nakamura, who had over a year left on his contract at Espanyol.
"There is also pressure on me as people will expect me to deliver but the aim is to win the J-League title here."
Nakamura signed a two-year deal with Espanyol after winning three Scottish Premier League titles with Celtic.
He had a successful spell at Italy's Reggina after leaving Yokohama in 2002.
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