Stoke City assistant manager Dean Holden has parted company with the Championship club.
He took over as interim boss following O'Neill's sacking on Thursday.
But, with Alex Neil set to take over, Stoke announced his departure late on Saturday evening after Holden had led the Potters to victory at Blackburn.
Neil, who was given permission by his current club Sunderland to have talks with Stoke, was at Ewood Park to watch Stoke win - but there is no indication yet as to when an official appointment will be confirmed.
Potters joint chairman John Coates said: "The professionalism that Dean brought to his position with us has never been more evident over the last 48 hours, culminating in him guiding us to victory at Blackburn.