Tottenham Hotspur are said to be working on extending one of their players’ contracts in what would be a surprise move. Spurs’ primary focus at the moment is on the North London derby against Arsenal on Sunday. A win against their fierce rivals will give them a huge boost in their pursuit of a top-four finish, and that will be at the forefront of Ange Postecoglou‘s mind. Irrespective of what happens from now until the end of the season, Tottenham are expected to be very active in the summer transfer window. All eyes will be on incomings but there could be a few Spurs players who could leave as…