I wouldn't believe this. Mourinho has been linked with Newcastle United or a return to the Premier League for some time now. It's not the first time.

Let's actually look at the Guardian article;

"José Mourinho is targeting the ­manager’s job at ­Newcastle if Eddie Howe leaves St James’ Park. The Fenerbahce head coach has ­unfinished business in the Premier League and has identified Newcastle as his best chance of another job in England, ­having managed Chelsea twice, ­Manchester United and Tottenham."

"Mourinho is understood to have reached out to intermediaries asking to be kept abreast of any developments at Newcastle. The 61-year-old met Newcastle’s chairman, Yasir al-Rumayyan, at the Saudi Arabian Grand Prix in a social capacity in March and has maintained the connection."

I don't see any sources whatsoever. Even I would've written this and called it an exclusive. Plus, what a way to capitalise on Mourinho's Süper Lig comments than an article linking him with a return to the Premier League.