Craig Shakespeare was sacked as Leicester boss because the club did not consistently fulfil their early promise under his management, according to vice chairman Aiyawatt Srivaddhanaprabha.
Shakespeare was relieved of his duties on Tuesday afternoon, just four months into a three-year contract he signed in the summer.
The 53-year-old replaced Claudio Ranieri on a caretaker basis in February but was given the job on a permanent deal after keeping the 2015-16 champions in the Premier League and guiding the club to the quarter-finals of the Champions League.
However, Leicester have won only one league match this season and sit in the bottom three of the table after Monday night's 1-1 home draw with West Brom extended their winless run to six Premier League games - the same as when Ranieri was sacked earlier this year.