The Nigeria international is yet to break his duck for WBA.
"Just because he hasn't been scoring doesn't mean he hasn't been a great player," said Berahino. "I see him day in day out on the training pitches and he is a good finisher. His fitness wasn't there because he joined us a bit late but he is understanding the team.
"It's hard as well because it's a new environment for him in the Premier League. I just think you've got to give him time to adjust.
"He is confident, he has come in and hasn't been shy. He speaks to everyone. Unfortunately he got an injury. He got his goal and I know he was gutted. Hopefully we can get him back fit because we'll need him."
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