Bolton, fresh off a 4-1 loss to Tottenham on Wednesday, are third-bottom and must find form in their final two fixtures to avoid playing in the Championship next season.
Even if they beat West Brom and Stoke City on the season's final day, two wins for Queens Park Rangers from their remaining games will see Wanderers relegated.
"We have two huge games now to decide our own fate," Bolton manager Owen Coyle said.
"We've shown before that we have the character to bounce back and that's what we will do. We will dust ourselves down and be ready for Sunday when we go again against West Bromwich Albion."
Playmaker Chung Yong Lee is an outside chance to make his comeback 10 months after he was stretchered off with a double fracture of his right leg in a pre-season friendly against Newport County.
The 23-year-old South Korean star survived a reserves team hit out last week and could be selected on the bench.
Coyle's charges will also be boosted by the availability of defender Gretar Steinsson who has missed the past two matches due to illness.
Midfielder Darren Pratley is another in line to play after sitting out the past four matches with a virus.
West Brom and new England boss Roy Hodgson will not want his players resting on their laurels at the Reebok Stadium, where they will be buoyed by a large travelling contingent of at least 4400 supporters.
West Brom, on course for a top-10 finish this season despite losing their opening three games, will be desperate to finish Hodgson's stint at the Hawthorns in winning fashion.
They have already achieved two of Hodgson targets for the season including staving off relegation and finishing the campaign as the best-placed West Midlands club.
But they are yet to deliver on his third assignment - bettering the 47 points picked up last year - but a draw on Sunday would see them equal that mark with a game to spare.
soccerway.com