When Robin Propper became Rangers’ ninth summer signing on August 1st, Philippe Clement and Nils Koppen appeared ahead of schedule in their desire to create a potentially title-winning squad at Ibrox. But in the last three weeks, things have stalled. Clement admits that Rangers have to sell before they can buy. And while there is a renewed sense of positivity – Ianis Hagi, Rabbi Matondo and Ben Davies could all be shipped out this month – a hitherto highly-promising window could have a rather frustrating conclusion. Tiago Gouveia, the talented Portugal Under 21 international, is among those wh…