HITC Sport understands a number of clubs are tracking Sunderland defender
Loris Karius now is a Liverpool player.
Spurs will have to do battle with a Premier League rival for the Mainz star.
The Turkish international is available at a cut-price fee.
The Turkish international has been in top form in the Bundesliga this season.
German publication Bild claims Mainz have snubbed an offer from Leicester City for Shinji Okazaki, with the striker considered too important to move on.
Liverpool are keen on signing Loris Karius.
Mainz' brief trip to England in July could cause Arsenal and Tottenham to fight over one of their youngsters.