Celtic were following the Tottenham star's progress before he moved to White Hart Lane.
Ibrox side Rangers need to invest in the summer in order to compete with Celtic, says Falkirk manager Peter Houston.
Rangers will take on Falkirk away from home in the Scottish Championship this evening.
Mark Warburton's side enjoyed an excellent weekend to extend their lead at the top of the table.
Rangers have the chance to cement second place in the Scottish Championship while Falkirk need a win to keep their play-off hopes alive.
Rangers travel to the Falkirk Stadium looking to temporarily edge past Hibernian into second place.