New trio make winning West Brom debut
After a goalless first half at the club's Great Barr training ground, Irvine made 10 changes during the break.
Dorrans opened the scoring on 54 minutes after a driving run through the middle of the park and 20-yard strike into the top corner.
Berahino doubled the lead 13 minutes from time after racing onto a through ball and applying a cool finish.
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