The long-term future of one of Tottenham’s most important commercial deals could be under threat. For many financial analysts’ money, Spurs are the best run club in the Premier League. Their focus on sustainable growth rather than high-risk activity in the transfer market means they are uniquely well-placed to spend under Profit and Sustainability Rules (formerly financial fair play, or FFP). Daniel Levy‘s approach, which admittedly has frustrated Spurs supporters at time during his premiership, places emphasis on matchday income and commercial revenue. Those two revenue streams are worth a co…