In a thermodynamic system, entropy is the measure of order, disorder, and/or chaos.
Although certainly not a complete list, I would think this is one that is quite comprehensive.
And using my username's uh...namesake, this could serve as THE measure of sorts. Whether it's of order, disorder, and/or chaos, or all of it all at the same time in a transfer window system under "atypical" conditions, is entirely up to you, the reader, and as well as the variables you include with which you observe, experience, participate in, or otherwise, with the system.
This is a guide that follows the formulaic reasoning of the mainstream media (and even of certain segments of Arsenal fans). In short, I made the "hard work" for you already! You don't have to read the articles to know which player is being bandied about, the names are listed here for your convenience.
Daniele de Rossi
Stephan El Shaarawy
Angel di Maria
Hatem Ben Arfa
Out of left field:
Douglas Pereira dos Santos
Paulo Henrique Ganso
Giuliano Victor de Paula
Somebody missing? Violently non-violent and chaotically tranquil objections/reactions? Well, that's what the comments section is for!
Updated (12:32am GMT+8, 5/24/2014): Added Bernard, Frey, and Kalou
Updated (12:27pm GMT+8, 6/4/2014): Added "out of left field"