Swansea midfielder Kemy Agustien has picked up a hamstring injury that could be set to keep him on the sidelines for six weeks.
The Dutchman had made a strong start to the season for Swansea but limped off in the second half of Saturday's 1-0 defeat to Arsenal at the Emirates Stadium to be replaced by Mark Gower.
The indications are that he has torn a hamstring and may be out of action until late October, leaving Swansea to consider their options in the centre of the field.
While the club have not yet confirmed the length of the likely lay-off, assistant manager Colin Pascoe has admitted it is disappointing to lose such a player.
However, Pascoe is more optimistic that Wayne Routledge will be fit to face West Brom on Saturday after sitting out the clash with Arsenal due to an ankle injury.
"It's a blow losing Kemy because he has been a strong player for us," Pascoe told the South Wales Evening Post.
"And we didn't want to risk Wayne at Arsenal, but he should be back next Saturday."