Daniel Levy should be looking over his shoulder.

Across London, at the Olympic Stadium, West Ham United fans are rebelling against the ownership of the club. There were protests before their 1-1 draw with Everton, with supporters calling for David Gold, David Sullivan and Karren Brady to leave the club and allow new owners to take over.

There is something similar brewing at Spurs. An admittedly small minority of fans unfurled a banner at the club’s 2-1 FA Cup win over Middlesbrough, reading: “Thanks for no memories. Time to say goodbye. Levy out!”

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Now, ignoring the stupidity of the statement – these fans surely remember that incredible Champions League semi-final win over Ajax, the title challenges under Mauricio Pochettino and the 3-1 thumping of Real Madrid at Wembley – this is significant.

All of a sudden, there is a possibility that a movement could take hold at Spurs and that Levy could well see his stint as chairman – it must be said that Joe Lewis, who is not often seen at matches, is the actual owner of the club – called into question.

It is telling, too, that this protest has started in the January transfer window. Thus far, Levy has done a deal for midfielder Gedson Fernandes, bringing him in from Benfica on an initial loan.

The lack of a striker has sharpened the focus on the seldom nature of investment in the squad. There is nothing to say that Levy couldn’t have signed an alternative to Harry Kane in the summer; now the England captain is injured, Spurs have left themselves scrambling around the transfer market.

A number of options have been offered to the club according to FFC sources, from Borussia Dortmund’s Paco Alcacer to Crystal Palace’s Christian Benteke, and now comes an acid test.

Spurs remain in contention to qualify for the Champions League this season but they will need to improve their form.

They sit six points behind Frank Lampard’s Chelsea in fourth but this is a club operating without an out-and-out centre-forward.

There has long been a suspicion that Levy does not pay the going rate for players and that his haggling can cost the club in the transfer market. That would certainly explain how Spurs went two whole transfer windows without bringing in a single player.

As the January window winds down and comes to a close, he needs to pull a rabbit out of the hat, for the sake of Spurs’ season and for his own reputation.

Failure to do so will surely see more banners and more protests.

Meanwhile, Spurs fans have debated the signing of a global superstar!