I can't see Rom leaving mid-season but, if our performances don't improve, I can see him leaving in the summer. I'm a big fan of his and would hate to see him go but I do love to speculate about transfers. Here goes nothing.
1. Michy Batshuayi (Marseille) - We've been linked before and he's been excellent both as a sub (last season) and as a starter (this season) for Marseille.
2. Charlie Austin (QPR) - He's already been mentioned here and rightfully so. He scored plenty in the PL last season and his underlying numbers (shots, conversion rate) suggest that his performance is sustainable. It's a bit surprising that he's still in the Championship.
3. Andrej Kramaric (Leicester) - He's had a hard time getting into Leicester's team so I'm sure this idea will be met with plenty of opposition but every time I've seen him, his movement, touch, vision, and ability to create space for a shot has been excellent. I think he could be a steal if we put a little faith in him. Chelsea were interested before he signed for Leicester.
4. Benik Afobe (Wolves) - Ex-Arsenal youth and probably the biggest wild card of the bunch. I haven't seen a lot of him outside of his excellent and opportunistic performance for MK Dons against Manchester United last season (United were shambolic at the back so it's hard to extrapolate too much from that game) but he's been scoring goals regularly in League One and the Championship and, if you believe in WhoScored stats (I'm not completely sure I do), he's a good passer as well.
Once again, I am pro-Lukaku and I don't think any of these players would necessarily improve on him. But we can replace some/most of his production (and pocket a little money) if he does decide to go.