As Arsenal scrabble for the purchases they need to progress, one player seems to skirt under the radar, attracting no notice while being possibly one of the better targets in this window.Perhaps it is down to the fact he plies his trade for our neighbours, but it seems inconceivable that we haven’t approached Toby Alderweireld with a bid.The Belgian has a release clause of £25m, and while this clause does have an expiry date, it does give admirers of the defender a lucrative window to snap up a top player for what is looking like an incredible bargain price.Alderweireld is exactly the type of player we need to marshall what is now appearing to be a massively understrength defence.With Laurent Koscielny pushing for a departure from the club, it leaves Shkodran Mustafi, Sokratis, an injured Rob Holding and Calum Chambers as our defenders, with Dinos Mavropanos likely to go out on loan. That is severely undernourished when it comes to fighting it out for top four positioning, domestic trophies and in Europe.Toby Alderweireld also fits in line with our budget, is already Premiership acclimatised and is above all else – consistent.Could we go in for him? There seems to be no reason why not, but the only club so far linked with the Belgian is Roma. Why aren’t we going for the man? It seems infuriating that a player of his calibre, with that steal of a price, is not even in our sights. If faced with a choice between us and Roma, relocating or being able to stay where he currently lives – wouldn’t Alderweireld surely prefer the red and white of Arsenal?The Belgian will surely be snapped up sooner rather than later, despite Alderweireld ticking every box for our immediate future. We could recruit from Europe or Latin America, Africa or closer to home from the Academy – but Alderweireld is surely the best option?We will soon find out Alderweireld’s situation, but can anyone explain why the defender hasn’t even been approached? Why he isn’t registering on our interest scale?Who knows where the defender will end up, but chances are it won’t be us he joins – and we can only rue the fact a perfect transfer has slipped up by.