Stoke City parted ways with their coach, Narciss Belak, after only 19 matches as coach of the club, stating that the Spaniard “is not the right person.”
Bilash replaced Steven Schumacher on 18 September, signing a three-year contract, but has won just three times in the Championship, most recently on 6 November, and the Potters sit 19th in the table.
They were beaten 2-0 by Leeds United on Boxing Day, with the 36-year-old He was criticized for his constant tactical changes.
In a statement, sporting director John Walters accepted responsibility for the appointment and Belach's inability to turn around the club's fortunes.
“Narcisse is a talented coach with tremendous potential,” Walters said. “He works relentlessly hard and I have no doubt that he will continue to achieve success in the future.
He added: “However, with the way the results and performances have been in recent weeks, we have to accept in hindsight that he has proven that he is not right for this club at this time.”
“I take full responsibility for this and I am absolutely determined that we will now make the right decision moving forward.
“Every decision we make stems from our love for Stoke City and our absolute determination to bring success to the club.”
Bilac was former Stoke striker Walters' first appointment since taking over as sporting director Earlier this year.