Both sides meet at the King Power on Sunday afternoon.
West Ham United boss Slaven Bilic has told the club's official website that he knew back in August that Premier League leaders Leicester City were going to be "extremely hard to beat" for any side this season.
Claudio Ranieri's side took another step toward completing their fairytale story by beating Sunderland 2-0 at the Stadium of Light last week to move 10 points clear, which second-placed Tottenham Hotspur later reduced to seven points again.
Another test awaits them tomorrow as they welcome the Hammers to the King Power Stadium, having already beaten Bilic's troops in the reverse fixture at Upton Park in the second game of the season on August 15.
It was only 2-1 to the Foxes that day, but the Croatian manager admits that he saw something special about Ranieri's troops, revealing that he indeed told his Italian counterpart this at full time.
“I wouldn’t say I thought they would be in this position – nobody would have said that at that time – but what was obvious after their first two games, I said to myself, my staff and Claudio Ranieri that they had a team which was going to be extremely hard to beat, no matter who they played against," he told the Irons' official website.
“I didn’t know they were going to be big-time favourites to win the league in this moment."
West Ham have flirted with a fairytale themselves as Bilic's side could still secure Champions League football this season, though they sit sixth in the table, five points behind fourth-placed Manchester City with only six games left.