Ji, who spent time training with Championship side Reading during his youth career, says he wants to go where he will be guaranteed first-team opportunities.
"My team and agent are still negotiating closely (with two teams)," Ji told Yonhap News.
"Personally, I want to play at the best possible team where I have the best chance of playing time.
"PSV is a great club that often finishes at the top of the league. But I've heard the level of the Dutch league is no longer what it once was.
"Sunderland is a team whose squad is always changing because it is a mid-level club. But they are playing in the Premier League."