Hoos became Chief Executive at the Walkers Stadium in June 2008 and the American has become the latest individual to fall victim of a new regime, having already overseen mass changes to the club's backroom staff during his time at the club.
The former Southampton employee played a major role in seeking and negotiating with new players arriving at the club and Hoos will no doubt be missed at such a crucial stage in pre season.
However, Hoos departure is a sign that Foxes owner Aiyawatt 'Top' Raksriaksorn, together with his father Vichai - owner of the club's major investors the King Power Group - have a replacement lined up to take charge of overseeing any imminent transfers.
Chief Finance Officer Mark Johnson has also left the club in what appears to be a major shakeup of the backroom staff at the Walkers Stadium.