Cameron Carolissen will receive a bye through to the second round of the William Hill World Darts Championship, with Martijn Kleermaker and his intended replacement Josh Payne ruled out of the tournament.
Dutchman Kleermaker had been set to make his World Championship debut on Sunday (December 20) against Cameron Carolissen, following an impressive first year on the PDC circuit.
However, the 29-year-old has tested positive for Covid-19 and has been withdrawn from the event as per PDC protocols.
Martijn Kleermaker said: "I am very disappointed that I won't be able to take part in the World Championship.
"My health is my main priority and currently I am not displaying any symptoms, but I would ask everyone to respect my privacy at this difficult time.
"Thank you for your support and understanding."
As confirmed prior to the PDPA Tour Card Holder Qualifier being played, England's Payne - the highest ranked player of the six final round losers at the qualifier - was due to replace Kleermaker in the draw.
Although Payne has received a negative Covid-19 test, he has been in close contact with someone in the last 24 hours who has returned a positive test and therefore has to self-isolate in accordance with UK government protocols.
With no further opportunity to replace Kleermaker before the scheduled tie, Carolissen now receives a first round bye, with Sunday's evening session to feature just three matches from 1800 GMT.
All other players and officials tested so far have received negative results.
William Hill World Darts Championship
Sunday December 20 - Revised Schedule
Afternoon Session (1200 GMT)
3x First Round, 1x Second Round
Derk Telnekes v Nick Kenny (R1)
Jason Lowe v Dmitriy Gorbunov (R1)
Maik Kuivenhoven v Matthew Edgar (R1)
Vincent van der Voort v Ron Meulenkamp (R2)
Evening Session (1800 GMT)
2x First Round, 2x Second Round
Cameron Carolissen - Bye (R1)
Keegan Brown v Ryan Meikle (R1)
Jeffrey de Zwaan v Ryan Searle (R2)
Jonny Clayton v John Henderson (R2)