Coach Steve Harrison has left Coventry by mutual consent.
Harrison was brought to the club by former boss Chris Coleman and also worked alongside Aidy Boothroyd and current manager Andy Thorn.
City chief executive Tim Fisher said: "We thank Steve for all his efforts over the past three years and wish him every success for the future."
"As we said at the end of last season, it is time to look at all aspects of the club as we prepare for life in League One," he added.
Coventry were relegated from the npower Championship last season, dropping down to the third tier for the first time since 1964.