The switch has seen him earn a recall to the Norway squad this week.
Johansen told VG: "I was hoping for a better season in the Premier League. When you go for a long period without sufficient playing time, it was enough. My job is to play football.
"I needed playing time and I got that with West Bromwich. You feel completely different with a couple of matches in your legs.
"There is much more continuity."
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