The 31-year-old joined the R's from Manchester United in the summer, but he has struggled to influence QPR in the early stages of the season.
However, Fernandes has refused to entertain suggestions that Park could be sold in January.
"It's a new experience for him in that he's never played so much," Fernandes told Yonhap News Agency.
"He also has to adjust to new players. I am not the sort of person that's going to write people off after six or seven games."
QPR currently occupy bottom spot in the Premier League.