Sam Vokes celebrates at the final whistle after scoring Burnley's winner against Leicester
The fallen champions were convinced that Sam Vokes handled the ball before he turned in Michael Keane’s knockdown from a Scott Arfield corner with just three minutes left.
TV replays suggested they had a strong case but the fact is that Claudio Ranieri’s men are now in the thick of a relegation battle.
The club spent a large chunk of the build-up to this trip fending off bids from Sunderland for striker Leonardo Ulloa, who was so disgruntled at being denied a move that he has threatened never to play for the Foxes again.
This was a tough night for them. Ashley Barnes almost struck early for Burnley, outpacing Wes Morgan to reach Andre Gray’s flicked header before driving a shot across goal and wide.
Leicester were left fuming with referee Mike Dean at Turf Moor
Leicester’s defence were flat- footed at times and Morgan was slow to a loose ball that Gray pounced on and fired high into the side netting.
Jamie Vardy had a chance midway through the half as a Matt Lowton back-pass fell short, but the striker, seeking his first goal of 2017, missed the far post from a tight angle.
Sean Dyche’s Burnley were lifted by two deadline day signings, having brought in winger Robbie Brady from Hull for a club-record £13million and midfielder Ashley Westwood from Aston Villa for £5m.
But they were outraged at having two penalty appeals rejected in quick succession before half-time, as Keane felt he was nudged by Danny Drinkwater, before Barnes claimed a push by Danny Simpson – with the latter two then becoming embroiled in a shoving match.
Vokes and Burnley celebrate scoring against Leicester at Turf Moor
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Joey Barton, making his first Premier League start since May 2015, went close with a couple of long-range shots in the closing minutes of the half, and Arfield had another effort deflected just wide.
Barton had the home fans on their feet again with a drive that whizzed inches wide early in the second half. Then Arfield rolled an effort just beyond the far post, and Kasper Schmeichel reacted well to turn Gray’s effort aside.
Leicester had their best spell of pressure after that – and that was when Vardy’s two big moments came and went.
But it was Burnley who remained on top as they continued to chase a winner in a gripping second half, with Ben Mee powering a header inches over the bar from a corner, and Schmeichel getting down superbly again as Gray threatened to take on the Leicester defence all on his own.
Then came Vokes’ late winner as Leicester’s struggles continued.
BURNLEY (4-4-2): Heaton 6; Lowton 6, Keane 7, Mee 7, Ward 6; Boyd 6, Barton 7, Hendrick 6 (Tarkowski 89), Defour 6 (Arfield 34, 7); Gray 7, Barnes 7 (Vokes 79). Booked: Lowton. Goal: Vokes 87. NEXT UP: Watford (a), Sat PL.
LEICESTER (4-4-2): Schmeichel 7; Simpson 6, Morgan 5, Huth 6, Fuchs 6; Mahrez 7, Drinkwater 6, Ndidi 6, Albrighton 6 (Okazaki 77); Gray 5 (Musa 66, 6), Vardy 5. NEXT UP: Man Utd (h), Sun PL.