
 Originally Posted by 
Cat Harrison
					 
				 
				From wiki:
"Some formations are not allowed in Top Eleven and may lead to 20% ball possession, which in turn reduces the chance of victory.
Throughout the whole match you must have:
    a goalkeeper (blue)
    at least three defenders (green) (DL/DC/DR)
    at least one striker (red)
    at least one player on both flanks.
    at least four players in the opponents half (ML/MC/MR or AML/AMC/AMR or ST)
    at least three players in the midfield section (AML/AMC/AMR and/or ML/MC/MR and/or DML/DMC/DMR) 
One player on each flank is enough, but three players on the same flank will also lead to 20% possession. "