Collyer moves to the Hawthorns on a season-long loan.
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West Brom sporting director Andrew Nestor told the club website: "Toby is a dynamic midfielder who we rate highly and believe that his strengths will complement our already strong midfield options.
"He is an ideal central midfielder for our playing model with his physical attributes, progressive play and passing ability, and has the capability to make a real impression this season."
Collyer could make his debut on Saturday, when the Baggies travel to Wrexham.