There's a reason Spurs have one of the best defences in the Premier League - it's largely down to Toby Alderweireld.
The centre-back's partnership with Jan Vertonghen has seen the Lilywhites concede just four league goals this season, but it looks like they may now be without him for quite some time.
The Belgian was taken off in the second half and replaced with Eric Dier after a nasty-looking knee injury which saw him collapse to the floor once he'd walked one pace on it.
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As far as Tottenham players go, they don't come much more pivotal than Alderweireld.
Mauricio Pochettino has already been without star man Harry Kane for several weeks, while Mousa Dembele has also been carrying a knock - to cut a long story short, this is about the worst thing that could possibly have happened at the Hawthorns.
Spurs won't know the extent of Alderweireld's injury for another 48 hours once he's undergone a scan, but that didn't prevent the inevitable meltdown on Twitter that followed the sight of last season's Player of the Year being stretchered off.
Some of the reaction may be a tad over-the-top, but that just sums up what a huge player he is for the north Londoners.
Despite the visitors dominating for the vast majority of the game, it wasn't long before they started to miss him, conceding to old boy Nacer Chadli in the 82nd minute before Dele Alli's late equaliser.
It's difficult to see him playing any part against Bayer Leverkusen in the Champions League on Tuesday and a trip to Bournemouth on Saturday follows.
Pochettino and fans alike will be pinning their hopes on Kevin Wimmer to step up, just as he did last season when Jan Vertonghen was ruled out for eight weeks.
Replacing Alderweireld takes some doing, though, and this could have a massive impact on the club's title ambitions.
How big an impact could Toby Alderweireld's absence have on Spurs' title ambitions? Have your say in the comments.