This is the Only Winter Signing Spurs Must Seal to Complete Squad

After 12 league games, Tottenham are in a decent position to push for a top four finish and they have got the quality to do exactly that.
However, the North Londoners surely need to make this one key signing in the winter transfer window to complete the squad. The signing of an out and out striker.
In the summer, manager Mauricio Pochettino focused on reinforcing the defense and the attacking midfield.

Kevin Wimmer, Kieran Trippier and Toby Alderweireld were secured to improve the back line and the defense is performing very well.
They already had Lamela, Chadli, Eriksen and Townsend in the end and the likes of Son and Njie were signed to strengthen the attack and provide more support to star striker Harry Kane.
As far as the midfield is concerned, stars like Dier, Mason, Alli and Dembele have been effective so far this season and they also have talented Bentaleb as another option.
However, Kane is the only natural center forward in the team and if he gets injured, there is no one to provide quality cover for him. Hence, Spurs must sign a natural goalscorer in the winter window.