The girls volleyball draw was announced at 7 a.m. Monday and at 3:15 p.m. Andrean was looking for a new coach.
Third-year coach Julie Wiejak resigned from her position with the 59ers.
"We wish her the best of luck," Andrean athletic director Bill Mueller said. "She was here for two years and we wish her nothing but the best."
Andrean had been to back-to-back semistate appearances under Wiejak, who was a Bishop Noll grad and former assistant coach at Loyola and DePaul.
Wiejak had no comment Monday.
Wiejak was named a 20 Under 40 business leader by The Times in 2012 for her leadership on the volleyball court.
She is a member of the Positive Coaching Alliance, a non-profit whose mission is "better athletes, better people," according to its website.
"As coaches, we are preparing these players for their lives and we are helping them learn lessons that have nothing to do with anything on the scoreboard,” Wiejak said for the 20 Under 40 article last year. “We are helping them learn lessons about pushing themselves, getting out of their comfort zone and taking risks."
When contacted Monday evening, Mueller said that by Tuesday an interim coach would be chosen.
"We're working diligently so that the team stays where it's been at and prepared for sectionals," Mueller said.
Andrean will play Kankakee Valley at 7:30 p.m. on Oct. 24 in the first round of the Class 3A Knox Sectional. The 59ers are the defending sectional champions.