Albion have signed 36-year-old Wes Hoolahan on a short term contract.
The former Norwich forward trained with Albion during the recent international break and will be at The Hawthorns until at least January.
Baggies boss Darren Moore said the former Republic of Ireland international brings a new element to Albion's attacking line.
He said: "He is a great pro and I think everyone knows the quality he possesses. He gives us more depth and fantastic experience.
“The agreement is short term but there is the potential for Wes to stay longer if things work out. I’m delighted to get him here.
“We’ve got seven games in 21 days in October and we are going to have to manage the squad to cope with the demands of that schedule. Every single player will be important to us.”