Huddersfield's top-flight status is also precarious.
West Brom are bottom of the Premier League and seven points from the safety of 17th place, a position now occupied by Saturday's opponents Huddersfield.
West Brom are seriously struggling and it looks like only a matter of time before they are relegated to the Championship.More news: Cheesecake Factory Inc (CAKE) to Issue Quarterly Dividend of $0.29
"Our focus this week is winning the game".
West Brom's loss in the FA Cup at the weekend was their fifth defeat of 2018. That feels generous. Gracenote predict between 36 and 37 points will be required to stay in the Premier League this year, meaning Albion must win another 16 points from their final 11 games, or 1.45 points-per-game - a higher ratio than they have achieved in a single season since 1985.
"This has been one of my toughest weeks as a manager".
"I sense with our fans, they're disappointed as I am".
Jake Livermore and Kieran Gibbs are back from injury and are ready for selection.
If West Brom are to get anything from this game they will need to contain the threat of Huddersfield's attack, and centre to that attack is Steve Mounie.More news: 10-Year-Old Child Shot To Death, Woman Wounded In Asbury Park
As for the visitors, Michael Hefele missed out on Huddersfield's FA Cup defeat to Manchester United through illness, however is set to return to the squad this weekend.
When asked about West Brom's stolen taxi saga in Barcelona, Wagner told The Sportsman at his pre-match press conference on Thursday lunchtime: "Sometimes these incidents happen".
Pards added: "The words "must win" are an irritant but we know how important it is". West Brom's last five matches have all seen over two goals as have two of Huddersfield's last three games.
The Hammers reached 30 points with a 2-0 win over Watford last time out, some turnaround given the East Londoners were languishing in the relegation zone with just nine points when the Scot took over in November.
With West Brom winless in their last four Premier League games, there will likely be a nervous tension around the Hawthorns come Saturday and the Baggies will need to start quickly.
"We're Huddersfield Town and I think when any opposition team plays against us they think we're a team they should beat".More news: UK PM May To Give Vision For Future EU Relationship In Speech