The loss ended the Foxes' unbeaten home record of 20 games and added even more disappointment to an already disappointing start to their title defence. Tony Pulis' men were the visitors to the King Power Stadium on the annual Remembrance fixture and Leicester's fantastic tribute to those who served for the country in countless battles didn't match the flat performance on the pitch.
West Brom had the better of the first half and went close to scoring on a few occasions. The first half finished goalless and both teams came out relatively strong in the second period but it was the Baggies who drew first blood.
James Morrison's guided header from Matt Phillips' left the hosts needing an equaliser. It was Islam Slimani who provided this only three minutes later after he powered a header past Ben Foster after some great work by fellow countryman, Riyad Mahrez.
As the Foxes looked like they might have gone on and secured all three points, a catastrophic error from Danny Drinkwater handed Matt Phillips the chance to put his side back in front, which he took very well. The game finished 2-1 after some late pressure from Claudio Ranieri's side, much to the disappointment of the Foxes faithful.
We take a look at how the Foxes' players faired on a forgettable afternoon.
Ron-Robert Zieler - 5/10: The German 'keeper was brought in to replace the injured Kasper Schmeichel and didn't have a great afternoon. Although he wasn't tested all that much, he could've done more to prevent the second goal due to the lack of the height in Phillips's dinked strike. Also had a few nervy moments when being charged down by Salomon Rondon with one nearly ending very badly. Left with no chance of saving Morrison's goal.
Danny Simpson - 5/10: Defended relatively well but looked frightened when in possession of the ball. Always seemed to pass the ball backwards, often all the way back to Zieler which slowed down a lot of Leicester moves. Struggled to handle the pace of Phillips in the first half and got caught on the ball a few times by the Baggies winger. Cleared the ball off the line which saved an almost certain goal.
Wes Morgan - 6/10: The Foxes skipper handled the presence of Rondon very well but was unspectacular with a lot of his defensive play. Wasted possession on several occasions with aimless long balls towards Mahrez and Shinji Okazaki. As captain, he didn't provide a calming influence to the rest of his players which definitely showed throughout, not only the defence, but the rest of the team as well.
Robert Huth - 6/10: A quiet afternoon for the German defender but still saw his side concede two goals. Reacted well to dangerous situations and picked out a few good passes to team mates further up the pitch. Often had no one to mark due to the opponents only having one striker. Substituted for Leonardo Ulloa in the 87th minute.
Christian Fuchs - 6/10: Looked good going forward towards the end of the game and provided some good whipped crosses for his team mates but struggled defensively. Like Simpson, he found the pace and trickery of Matt Phillips hard to deal with in the second half. The Austrian was probably the best of all four defenders but still not as good as Foxes fans know he can be.
Riyad Mahrez -7/10: The Algerian was a shining light amongst a very dull Leicester side and although he hasn't quite recreated the magic he showed us all last season, he put in a solid performance on Sunday. Allan Nyom couldn't handle the winger's fast feet and it looked right from the start that anything good the Foxes were going to do was going to come through Mahrez. Probably the best shout for Leicester's Man of the Match after his fantastic cross assisted Slimani's equaliser.
Danny Drinkwater - 6/10: Although the England international cost his side a share of the points against West Brom, his performance was far from his worst. As Ranieri said, it was a rare Drinkwater error that led to the winning goal and was an unfair refelction on how he played. His crossfield passes to Mahrez worked on several occasions and his positive forward passing was refreshing for Leicester. A few misplaced passes and a horrendous error subsequently shadowed the midfielder's performance.
Andy King - 5/10: The ever-present Foxes midfield man was less than impressive. He looked sluggish on many occasions and, although his passing was mostly good, he was beaten to most first and second balls in the middle of the park. His failure to track Morrison meant the Scottish midfielder had plenty of room in the box to calmly direct his header into the corner of Zieler's net.
Ahmed Musa - 6/10: A game of two halves for the Nigerian. A massively quiet first with nothing to really write home about before an explosive second half where he managed to get to the by-line several times in a short space of time. Lots of his runs were fruitless though as the West Brom defence wised up to his very predictable attacks. Substituted for Demarai Gray in the 67th minute.
Shinji Okazaki - 5/10: Struggled against a set of very physical defenders. Failed to get control of the ball when he had it and never looked like causing any sort of trouble for the Baggies' back line. His tireless work-rate was good but didn't produce anything in the way of chances. His afternoon was rightly cut short at half time as he was replaced by Jamie Vardy.
Islam Slimani - 6/10: Like Okazaki, he never looked like doing anything effective for a large part of the game. Also, uncharacteristically failed to win a large proportion of his aerial battles. Although, the one header that really mattered was the one he directed into the back of the net. He stayed onside well and took his only real chance of the game very well, but other than that, he seemed to find it tough.
Jamie Vardy ('45th) - 5/10: Another disappointing display from last season's hero, after replacing Okazaki at half time. Some nice interplay in the build-up to the equaliser was a rare spark in a below-average performance. His trademark work-rate was non-existent.
Demarai Gray ('67th) - 6/10: The England under-21 winger certainly made a claim to start in the future for Leicester, when he replaced Musa. Looked very lively every time he got the ball and always looked for a forward run/pass. The youngster was always looking for the ball and didn't do too much wrong when he eventually got it, a very promising effort.
Leonardo Ulloa ('87th) - N/A: Didn't have enough time to make an impact on the game however he did win a few headers when he came on for Huth.