The Baggies chief lifted the lid on his team plans for the game against the Premier League's basement club at the DW Stadium on Saturday and revealed that Nigerian hitman, Odemwingie, picked up a calf strain in last Sunday's 2-0 defeat at Manchester United and is likely to miss out.
January signing Keith Andrews is also in a race to keep his place in the midfield after picking up a knee injury with Hodgson set to see how he shapes up in Friday's training session before making a decision on his participation.
Billy Jones has overcome a hamstring injury which has sidelined him for three matches and will be in contention to play, while Jerome Thomas is also hoping to be fit following his own hamstring problem which kept him out of the United game.
Olsson will serve a one-match ban due to his red card at Old Trafford and Marton Fulop misses the trip to Lancashire due to chicken pox.
On Odemwingie, Hodgson told the club's website: "Peter Odemwingie is a doubt for the game and I wouldn't think he'll be fit.
"He has a calf strain, which to be fair he had some feeling of before the game at Old Trafford."