The 26-year-old former Man City winger has been in superb form since the turn of the year and picked up the Premier League Player of the Month award for January.
Seven of his nine goals this term have come in 2014, including a hat-trick against Fulham and one strike in an excellent display at rivals Newcastle United, where the Black Cats ran out 3-0 winners.
Spurs are now said to have joined the race to lure the winger away from his native North-East in the summer, when he could even be involved in England’s World Cup campaign, such has been his turnaround in fortunes.
If Sunderland survive the drop they will battle to hold onto Johnson, but his suitors could test their resolve with a £9million bid.