But he has played only four full games for the Cottagers this season, and has started one under new manager Rene Meulensteen.
"I haven't played a lot lately at Fulham so I see this move as a big chance for me," Ruiz told PSV.TV.
"I want to get my confidence back. (Moving to) PSV will help me achieve my ambition of being properly prepared for the World Cup. There is lot of quality at PSV and I'll do my best to help them to get as high as they can in the league."
PSV, winners of the European Cup in 1988, had a wretched start to the season in the Netherlands, going seven games without a win in league competition.
They recovered with two victories in December to climb to seventh in the table before the mid-season break. They resume their programme away at champions Ajax Amsterdam on Sunday.
(Reporting by Mark Gleeson, editing by Stephen Wood)
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