Jansson joined Brentford from Leeds and helped the Londoners earn promotion last season.
He told Sydsvenskan: "Brentford is my passion. That's what I live for besides my family. From the first day in Leeds in the Championship, the dream was to take the step up, and now I'm here. Every day is a favour. Every training is fun and every match is unique.
His contract with Brentford expires at the end of the season and at present it is unclear whether there will be an extension.
"The club have made the decision to wait and see how we adapt as a team and individuals to the Premier League. I like that. There is no stress, we know where we have each other. And if it's not Brentford, there are other places I can go. I do not sit in a bad seat."
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