The 21-year-old has shone for the Canaries in the Championship this season and such is the state of the vastly-inflated transfer market, it will take a sizeable fee to lure him away from Carrow Road.
Liverpool, Leicester and Manchester City are also said to be keeping tabs on the former Coventry star, so Norwich are confident they will be able to achieve their asking price.
Maddison has scored seven goals and provided five assists this season and although Norwich are reluctant to let him go this month, they will not stand in his way should big offers come in.
Tottenham have just allowed their young midfielder Marcus Edwards to head out on loan to Norwich for the remainder of the season which, according to some reports, puts Mauricio Pochettino’s men in the box seat to land Maddison.
Southampton remain in the hunt for Red Bull Salzburg's Amadou Haidara and are reportedly readying a £15million offer.
Aston Villa are reportedly weighing up a summer move for out-of-favour Huddersfield defender Michael Hefele.
Southampton are lining up a summer bid for Huddersfield Town midfielder Aaron Mooy, reports claim.