The Dudley-born manager has also earned a reputation as a survival specialist, where he performed miracles at clubs like Crystal Palace and Sunderland as he helped ensure their Premier League status.
Everton's communications department were unaware of this and an embarrassing situation was made worse when bookmaker Paddy Power released quotes given to them by Allardyce two weeks ago in which he dissected the team's problems. Unsworth will take charge of the Under 23s again along with his assistant John Ebbrell.
He continued: "Ultimately, it's the ambition of the club, the ambition of the owner and the board, allied to the fact that it's Everton and all the fantastic history, which have proved to be key for me".
Allardyce became the club's new manager on Thursday after signing a £6million-per-year deal
"I'm enjoying my life more than you could believe", Allardyce told the Daily Star.
The former Bolton manager was adamant that he would never make a return to club football, but he admitted he could not resist the temptation of joining Everton.
Wayne Rooney scored a hat-trick and Ashley Williams netted a great header, as Everton picked up a 4-0 victory over David Moyes' side.
Allardyce's reign will begin on Saturday when Everton host Huddersfield Town. But, after taking four points from their first two games, Everton managed the same tally from their next seven fixtures and Koeman was sacked.
Having spent heavy to bring in reinforcements over the summer, Everton have struggled to click this season; the Toffees now sit 17th in the Premier League, two points above the drop zone, and have already been dumped out of the Europa League, following a disastrous showing in the group stage.
Oklahoma reports first two flu deaths; virus already worse than past year
The Georgia health department said there have been 14 flu-related hospitalizations so far this season. That could eliminate the need for people to get new flu shots each year.