The Costa Rican international joined the Dutch outfit in January, on a loan deal until the end of the season.
With Fulham's Premier League status for next year uncertain, it remains to be seen whether the Cottagers will ask Ruiz to see out his contract until 2015 or allow him to leave in the summer, and the 28-year-old appreciates that he will have to wait to discover what is in store for him.
"I am really happy here at PSV," Ruiz told Fox Sports Eredivisie. "They have a new project for next season to become champions with a strong squad. I would like to be part of that.
"But first we have to see what happens. There are still games left, possibly play-offs, and after that the World Cup. What will happen depends on several things. I still have one year on my contract at Fulham."
Ruiz has scored eight goals in 75 Fulham appearances since joining from FC Twente for £10m in 2011.