Next up for his side is a trip to Finland on Monday, when Berahino could well start again following his match-winning debut at the Madejski Stadium.
"They were brilliant defending but we won the game," the West Brom striker told BT Sport.
"At least we created a lot, that's a positive sign, but we've got to make sure we put them in against Finland.
"Gareth Southgate has been great, he's come in and introduced us to what he wants us to do.
"We prepared really well for this game and now we've got to concentrate on the next one."
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