Tottenham Hotspur are currently impressing under Mauricio Pochettino and are now looking to potentially strengthen their squad in the summer.
The report claims that Borussia Dortmund, who bid for the player in the winter, were now unsure on whether to make another move for the player in the summer, after his form dipped in the second half of the season.
But Spurs, Valencia and the mystery Premier League club are all still keen on the player who has a release clause of €10 million (£7.8 million).
Malli has scored 10 goals in 33 appearances for Mainz in what has proved to be an impressive campaign for him. The former German under-21 international has even made his debut for Turkey, after switching allegiance late last year.