Albion suffered late heartbreak to lose 2-1 against league leaders Leicester City at The Hawthorns on Saturday afternoon.
During a frantic final 15 minutes, Kiernan Dewsbury-Hall put the Foxes in front before Josh Maja thought he had earned Carlos Corberán’s men a draw towards the end.
However, the visitors stole it in stoppage time - Harry Winks coverting a clinical counter-attack to hand them all three Sky Bet Championship points.
The boss made three changes to his starting XI following the midweek win in Cardiff, as Semi Ajayi, Matt Phillips and Brandon Thomas-Asante replaced Kyle Bartley, John Swift and Jed Wallace.
Leicester were stronger in the early stages, James Justin curling over before Kiernan Dewsbury-Hall had a goal disallowed for offside.
But the Baggies grew into it and struck the post midway through the half via Cedric Kipre’s volley. Thomas-Asante also saw an effort saved and Phillips smashed a one over in a particularly good spell.
City did trouble the woodwork themselves, Darnell Furlong diverting Stephy Mavididi’s effort to Alex Palmer’s near stick, and also went close through Kelechi Iheanacho’s low drive - which went mere inches wide.
Despite those chances, the match was level come the interval with neither side able to break the deadlock during an interesting opening 45 minutes.
Albion created a couple of opportunities straight after half-time, however Grady Diangana’s shot was diverted over and Kipre curled into Hermansen’s arms from range.
Leicester were the team to strike first, though. Wilfred Ndidi’s cross found Dewsbury-Hall, and the attacking midfielder nodded home to hand them a 75th minute lead.
The Baggies thought they had stolen a well-deserved point with 60 seconds of normal time remaining, Maja poking in to score his first goal since joining the club.
They went searching for a winner yet, unfortunately, got caught on the break in the 94th minute - Leicester pouring forward and Dewsbury-Hall assisting Winks to tap home, condemning Albion to a rare Hawthorns defeat.
Albion: Palmer; Furlong, Ajayi, Kipre, Townsend; Yokuslu (Chalobah 86), Mowatt (Molumby 75); Diangana (Maja 75), Phillips (Swift 45), Sarmiento (Fellows 75); Thomas-Asante.
Substitutes: Griffiths, Taylor, Pieters, Pipa.
Attendance: 24,382 (2,009).