The 30-year-old would finish the campaign with a staggering 28 goals in Serie A in just 35 games, including 28 starts for Partenopei, but the summer passed without the forward moving away from Stadio San Paolo.
But perhaps news of the current release clause in Mertens' contract should tempt Spurs to keep a keen eye on how the striker performs over the coming months as he could prove to be a bargain signing in the summer.
According to Calciomercato, Mertens will be available for around £25 million at the end of the season if Napoli fail to win the league, while that release clause rises to around £30 million if Maurizio Sarri's men do claim the Scudetto this year - though Napoli are targeting agreeing a new deal where those clauses are removed.
Though Mertens will be 31 by the time the next transfer window opens, his form over the last couple of years means that he could still be an absolute bargain if he does not agree fresh terms by the time the season concludes.
He has already scored seven goals in seven league games this term while also contributing two assists, and if he can continue that kind of form until the end of the campaign there will surely a number of sides keen to exploit the clause in his contract despite his age.
And with Tottenham boasting a strong contingent of Belgian players, it may not be out of the question to suggest that joining Mauricio Pochettino's men would appeal to Mertens if he is given the chance and they enjoy some success this term.
And if Spurs are able to bring Mertens in and he is able to replicate the form that he has shown during his time in Italy, then perhaps Pochettino would have another game-changer in his ranks.