Millwall will seek to bounce back from their 4-0 mauling against Coventry on Wednesday as West Brom head to South London on Saturday (15:00 BST).
Though the Lions remain unbeaten in four games on the road, the defeat to the Sky Blues was a third in four on home soil, a run during which they have scored one goal and conceded nine.
They lie 12th ahead of the fourth-placed Baggies, three points ahead in a congested Championship table.
Albion ended an iffy run of one win in five with Wednesday's 1-0 victory at Norwich, which made it three wins from their four away games, only going down at table-topping Middlesbrough so far.