on the other side, i had 3 injuries in 3 friendlies >.< But still who cares :B

As for your best players, do you have any proof on how they performed without SA? Point is, i do think, if i remember it right, that you alwais trained SA into your new players at any season. You should try out not giving any to a couple of main and see if it changes much like you think, you could be surprised ;p