The tall, long haired Samaras played for Greece at the World Cup in June, scoring a dramatic stoppage time penalty to beat Ivory Coast and send his country through to the knockout stages for the first time.
"We’ve signed a player with vast experience and I’m delighted to welcome Sami to the club," Albion's head coach Alan Irvine said.
"He has played a lot of football at the highest levels – Champions League, European Championships and World Cups - and the feedback we’ve got on him, from people like (former Celtic manager) Neil Lennon, states he thrives on the big occasion."
Samaras, who spent six years in Scotland, will not be involved in Saturday's league game away to Southampton.
(Writing by Steve Tongue. Editing by Patrick Johnston)
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