"Everyone knows we're been looking to bring in an offensive midfielder with pace and we're delighted to have signed Andy," said West Brom manager Roberto Di Matteo.
"He can play wide or through the middle behind a striker and he'll be a good addition to the squad."
Slory's performances for Excelsior in the 2006-07 season earned him an international call-up and he won two caps on the Netherlands' tour to Asia in the summer of 2007.
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