VDS
B.Silva Lahm Zanetti
Salah Tevez
vs
Ronaldinho Kane
Coutinho
Vidic Ferdinand
Buffon
Hmm I'd be inclined to go for the first team despite the second team probably having the greater players. Not sure if you need one orthodox CB for six a side nevermind two, although in fairness most of the players named so far like Krol and Baresi offer plenty in possession too. It's been years since I played and when I did it was just a fun feck-around with friends but it tended to be just one player staying back sweeping and the rest doing whatever.
Neuer
Rijkaard
Modric Keane
Cruyff Romario
Neuer - great shot stopper and can start attacks
Rijkaard - all the stopper attributes necessary and great on the ball too.
Keane - his passing style of short, quick passes fizzed into the attackers feet is ideal for small-sided games, and defensively he''ll run all day, support Rijkaard, and bollock everybody bar Romario into doing their bit.
Modric - press resistant as feck, economical with the ball, Duracell Bunny off it.
Cruyff - greedy bastard pick, but with his speed of thought and technique he'd be unreal in small-sided football
Romario - couldn't resist picking him as he's just so impossibly great with limited space. Gerd Muller would probably be the better choice though as he'd press like feck off the ball, be just as ruthless a finisher, albeit lacking the genius close control of Romario.