The 25-year-old Czech does not plan on hiring a replacement until next season, and will work with her father for the last few tournaments of the year.
"Obviously I need a coach, but it's not the main thing in my team. I can play good even without a coach," Pliskova was quoted as saying by Kyodo news agency.
Pliskova, who is down to fourth in the rankings after her exit from the U.S. Open, said she was still hopeful of regaining top spot from Spaniard Garbine Muguruza because of how open the women's tour was this season.
"This year, it's very open when Serena (Williams) is not there. There's a chance for everybody, every grand slam has had a different winner. It's very close in the top 10," she added.
"For now, my main goal is to get to Singapore. Anything can happen. I think it's about few points so every tournament it can change. I just want to play well and if I play well, I have a chance to get to world number one again."
The top eight singles players qualify for the Oct. 22-29 event in Singapore which offers $7 million in prize money.
Pliskova, who is in action in the Pan Pacific Open in Tokyo this week, faces either Poland's Magda Linette or Daria Gavrilova of Australia first.
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Christian Radnedge)
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