Albion have agreed a contract with Trinidad & Tobago international Chris Birchall until the end of the season.
Albion manager Micky Adams said, "After the last couple of weeks we feel Chris has earned an opportunity to show us he deserves a longer-term contract.
"Once he's fully fit we're sure he'll be a real asset to the squad."
Chairman Dick Knight said, "Chris has earned this contract to show us what he can do. The Trinidad and Tobago international has some World Cup games coming up, but he is experienced in dealing with the travel involved and we're confident it won't affect his club performances."