Liverpool and Tottenham are considering moves for the 21-year-old midfielder, who has chipped in with eight goals and eight assists in 30 appearances.
Spurs manager Mauricio Pochettino is reportedly plotting a January swoop before immediately loaning Maddison back to Norwich for the rest of the season in a bid to beat their Anfield rivals.
And the bookies reckon Maddison could be on the move before the transfer window slams shut.
Liverpool and Tottenham plus Premier League rivals Arsenal and Everton are priced at 4/1 to sign the England U21 international before February 3.
Maddison is under contract at Carrow Road until 2021 after signing an extension last summer.