The 21-year-old completed his switch from Sky Bet Championship outfit Norwich City this week following a medical at Belvior Drive, signing a five-year contract with the Foxes.
Midway through the 2017/18 season, during which the Coventry-born midfielder scored 15 goals and registered eight assists, a maiden call-up to England's Under-21s came in November.
Maddison, the holder of three U21s caps, thus joins a lengthy list of City stars to have represented the Three Lions at senior or Under-21s level, adding to the core of English talent at Claude Puel's disposal.
These are the six other Foxes to have represented the national side at those levels...
Jamie Vardy
Since a maiden appearance in a 0-0 draw with the Republic of Ireland, replacing Wayne Rooney in the 75th minute, Jamie Vardy has cemented his status as a dangerous option for the national side.
Vardy's full debut came in a 6-0 rout of San Marino in the UEFA Euro 2016 qualifying campaign before scoring his maiden international goal in a 3-2 friendly success over Germany in Berlin in March 2016.
The former Fleetwood striker's stock rose further at the Euros in France, netting against Wales in a 2-1 group stage victory, and he would later strike vs. Lithuania in FIFA World Cup qualifying too.
Strikes in friendlies with Spain and Italy, meanwhile, established him as a rich source of goals against prestigious opposition - earning him a call-up to Gareth Southgate's World Cup squad.
Harry Maguire
Soon after signing for the Club last summer, Harry Maguire was rewarded for an impressive start to life at King Power Stadium with a first outing for England in a 1-0 away win over Lithuania.
Appearances in Wembley stalemates with Germany and Brazil soon followed for the Foxes defender and were added to in 2018 with two more successful shut-outs against the Netherlands and Costa Rica.
While he had represented England at Under-21s level in 2012, Maguire waited patiently for his opportunity at senior level and is expected to play a key role for the Three Lions in Russia this summer.
On Monday night, the Sheffield-born centre back became the Club's first English representative at a World Cup since 1966, providing an assist for Harry Kane's late winner against Tunisia.
Demarai Gray
Demarai Gray made his Under-18s England debut in a 4-0 victory over Belgium at St George's Park in February 2014, before later playing a part in the goal as the Young Lions fell to a 2-1 defeat by Croatia.
While injury forced him out of the UEFA U19 Euros of 2015, Gray was still able to play a role in the elite phase, starting against Denmark and France, while emerging from the bench versus Azerbaijan.
Gray's progress continued at Under-20s level at the Toulon Tournament in 2015, scoring against Morocco in a 3-3 draw and later featuring against Ivory Coast and Mexico.
A first Under-21s call-up came his way the following November and he made his debut in March 2016, going on to score six goals in 18 appearances for the Young Lions, including two at the 2017 UEFA U21 Euros.
The winger also wore the captain's armband for the Under-21s against Romania in March.
Ben Chilwell
Like Gray, Ben Chilwell has become an invaluable member of the Under-21s squad over recent terms, even captaining Aidy Boothroyd's men earlier this year.
The City Academy product played a leading role in England's UEFA U21 Euro 2016 campaign in Poland last summer, featuring in all four fixtures en route to the Semi-Final stage.
Chilwell's most recent appearance for England's youngsters came in a 2-1 success over Ukraine at Bramall Lane, where Gray and Maddison played in attacking positions.
In total, Chilwell has played 21 times for England at all levels, nine for the Under-21s, and is considered among the most likely candidates to make the next step over coming seasons.
Harvey Barnes
An impressive record at Under-18s level, with four goals in five outings, stood Harvey Barnes in good stead as Neil Dewsnip contemplated his Under-20s Toulon Tournament squad last summer.
On the back of a big year for the Countesthorpe-based midfielder, which included a debut in the UEFA Champions League, Barnes ultimately made the cut in France.
Barnes started the Final in Aubagne, where England took an early lead thanks to Sheffield United midfielder David Brooks’ 14th-minute effort.
But after George Hirst missed from the spot, the Young Lions were pegged back in the last minute as Ake Loba converted a penalty to haul Ivory Coast Level.
The tie went straight to penalties, with Barnes successfully converting the third of five spot-kicks to help his nation to a 5-3 shootout victory in Toulon.
Hamza Choudhury
Following in the footsteps of Barnes, who was forced to withdraw this summer with an injury, Hamza Choudhury also helped England win the Toulon Tournament this time around.
Choudhury came off the bench to assist England as they ground out a 2-1 Final victory over Mexico's youngsters to win the competition for the third consecutive year.
The Academy graduate played a significant role for England, with an assured substitute appearance helping his nation to preserve their one-goal advantage against Mexico.
Roberto Alvarado broke the deadlock at Stade Francis-Turcan but strikes from Dael Fry and Kieran Dowell handed England the trophy.