V-League foreigner quota reduced?

It's rumored that each Vietnamese club can register only 4 foreign players for V-League 2011 and field 3 in each game. This is a reduced number comparing to the register quota of 5 in some last seasons. It's believed to be the new solution of VFF against the rising number of naturalized players in V-League. As a matter of fact, 11/14 V-League clubs have at least one naturalized player.