Cardiff head to The Hawthorns deep in the mire after just one win from their last seven league games.
They sit 19th, three points adrift of safety, and with an inferior goal difference to everyone above them as the spectre of an immediate return to the Championship looms large.
After the Welsh club twice surrendered a lead to lose 6-3 to title-chasing Liverpool last weekend, the Norwegian conceded: "We can't carry on like this. We need points next week. That's for definite."
With Pepe Mel's side one of those perilously placed above the drop zone, three points clear in 16th, the stakes are high this weekend.
Mel's arrival in the dugout in January has failed to turnaround West Brom's slump in fortunes.
A 2-1 success at fellow strugglers Swansea City a fortnight ago was the Spaniard's first victory in charge, at the ninth attempt, and that poor run has dragged them towards the bottom three.
But Youssouf Mulumbu insists that the club's fans can also play their part.
"We need to show Cardiff this is going to be a long afternoon and we're there to win," the midfielder told the club's official website.
"I hope our fans can make The Hawthorns a scary place for Cardiff to play on Saturday.
"We want to do everything to stay in the Premier League and that's for the fans because they don't deserve to go to the Championship.
"This is one of the most important games for West Brom because this can make life really difficult for Cardiff and boost us."
