I thought I had it: Juliano Belletti (Barca+Chelsea, world cup winner 2002 + CL 2006), but he has been trained by Ancelotti (09\10 @ Chelsea) I think...
Beletti played w Messi. Maicon apparently never won World Cup. Deco either.
I googled it and apparently there's no answer, it's a dud question. I went through every Wiki of the WC winning squads etc etc and I can't find it. I officially give up.