Steve Evans' side made a lively start to the game and pushed the Premier League opposition back into their own half. Ben Pringle and Alex Revell both caused the Premier League side to panic in the early stages but the Millers failed to make their possession count.
On the half hour mark, new signing Leonardo Ulloa showed why his price tag from Brighton and Hove Albion was so much when he instinctively got on to the end of a rebound and put the ball past Scott Loach for the lead.
The former Brighton striker once again was at the thick of it as he grabbed a second goal, this time showing good movement in the box to get on the end of Ritchie De Laet's cross.
After the break, substitute Kieran Agard made a big impact for the Millers, first coming close with a free kick and then netting Rotherham's first, and only, goal of the match from 12 yards. Leicester, who had shown their class in the game when needed, responded promptly through last season's Player of the Year Danny Drinkwater to ensure the Foxes finished the match 3-1 to the good.
Nevertheless, there were many positives for Rotherham supporters to take away from the game, the biggest coming in the form of Chelsea loanee John Swift who made his first start for the Yorkshire club since moving on loan. Swift, who is considered one of the Chelsea's best young talents, signed for Rotherham last week and was considered a huge coup by the majority of the Championship's pundits.
John Swift announced Man of the Match on his home debut.— Cobham Chronicle (@cobhamchronicle) August 5, 2014
Upon signing, Rotherham's assistant manager, Paul Raynor, was notably brimming with excitement announcing the deal and from his interview you sensed that Rotherham had just landed a player who would be key to their survival chances this season.
''He's with us now and he'll get better and better the more time he spends with us,'' said Raynor.
''We'll get used to him, he'll certainly get used to us and we what we want from him. He's a great talent and he'll play a big part this season.''
The England Under-19 midfielder is a player with a lot of ability and a lot of attacking flair which will certainly excite Rotherham supporters this upcoming season. At Chelsea, he and Lewis Baker built up a very strong relationship in the Chelsea midfield which was integral to them going on to win the Under-21 Premier League. Baker, who won the Young Player of the Year award, was the runner and would provide the midfield with athleticism, whilst Swift would often add the spark that would win games.
Rotherham United's manager Steve Evans has worked hard this summer to put a team together ready for opening day where they're due to play Play-Off finalist Derby County in what could be Rotherham's toughest encounter of the season. The Rams, who lost the play-off final despite dominating large periods of the match, have managed to keep the core of their side together as well as adding in the likes of Omar Mascarell from Real Madrid and will be desperate to get off to a good start.
If Rotherham are to get anything from their opening day against Derby County on Saturday then there is a good chance that John Swift will be at the heart of it.