This will negate any attempt for you to surprise them (sneak attack) with a spell, to sneak up on a target and then use a spell to sneak attack you will need to use silent spell (feat) or a spell without a verbal component."[/i]
Is that the case?
No.
At best they will know what square you are in, but you will still be not visible to them.
Ask your DM if you can negate sneak attacks from a greater invisible attacker if they are making noise.
