O'Connor hadn't been starting for Luton anyway, so this will push him further down the pecking order.
I asked about this on one of the other forums, and got these responses:
Not good news for him to be honest (genius, I am). Morgan-Smith and Crow have been starting the last couple of games, while he's been coming off the bench. I'm sure you've noticed he's not scored as yet. Assuming Samuel and Fleetwood are fit and raring to go (I certainly hope they are), I doubt O'Connor will even make it as far as the bench for the next game.
Doesn't look good for him at all, he hasn't made a good start for us at all and I think he is going to really struggle to get in our team now.