I think Lukaku is a possibility, assuming the management are interested. I seem to recall reading that Jose would listen to offers for around £18m (roughly what they paid for him despite his stock rising IMO). Shift Dani out for £15m (or close) and our outlay is only £3m-£5m.
Would he come here? All comes down to whether he wants to stay in the prem. I can't see many other better destinations for him. Liverpool don't need him. Neither do City or utd. They all have a lot of options upfront. Arsenal and Spurs perhaps. Although I think Arsenal will go for Remy. Everton can't afford him surely? Unless maybe the sell Baines.
That leaves us or Spurs in my mind, so it is a possibility. Maybe.