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That is the warning from the Sweden defender, who has confirmed clubs are interested in his signature.
Jansson was one of Leeds’ more consistent players during another turbulent season at Elland Road.
The Whites saw their promotion hopes crumble around Christmas time despite a strong start to the 2017/18 season.
Now seeking a new manager and with £10m in the coffers after a partial takeover from San Francisco 49ers, Leeds are expected to spend this summer.
And Jansson, under contract at the club until 2022, admits he is waiting to see how Leeds act in the market before deciding on his future.
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I want to see their ambitions
“There is interest,” he told Swedish media at their World Cup press day.
“All I know is that I’m going to stay in England.
“It will be a lot for me to leave England. I really enjoy Leeds.
“But I want to see their ambitions, now is the time to get into the Premier League.”
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Leeds are closing in on a deal to appoint ex-Lille manager Marcelo Bielsa as their new boss.
The club sacked Paul Heckingbottom last week.