Michael Appleton has left his job as Oxford boss to take up the assistant managerial role at Leicester, the clubs have announced.
The 41-year-old joined the U's in July 2014, leading them to promotion from League Two in the 2015/16 season as well as two Football League Trophy finals.
Appleton, who has signed a three-year deal at Leicester, will team up with Craig Shakespeare, who was also recently handed a three-year contract after keeping the Foxes in the Premier League.