Yep, he will be able to stop LV from entering his mind, also because he knows what can drive him out of his mind, namely love (eg love for sirius). I think LV's able to enter Harry's mind because of the backfireing AK-curse in Godrick's Hollow. I think DD says so somewhere (in OotP), that some powers were transferred from LV to Harry, and that there's a connection between them because of that.. So he, LV, (probably) doesn't have that kind of a connection with Neville, and won't be able to enter his mind from a distance like he did with Harry! I hope I'm not making things up or something

as it's been a while since I've read OotP and I was a bit too hasty to take it all in.. I really should reread it one of these days..