There are lots of names I think would improve us.
GK - Thomas Kraft (Hertha Berlin)
CB - Grant Hanley (Blackburn)
CM - Aron Gunnarsson (Cardiff)
AM - Kostas Fortounis (Olympiacos)
ST - Arkadiusz Milik (Ajax)
There's 5, probably cost a total of about £35m, but well worth it.
Players worth a punt though is difficult. Gudmunsson at Charlton if he was cheap. I'd try to take Tiago Ilori from Liverpool but he's barely got any Premier League experiment and would be a risk. If Ryan Gauld is available from Sporting he'd be pretty good, but as with most continental players, he's probably got a daft release clause. I'd look at loaning from European giants or picking off players on the fringes of their first team, like Jese at Real Madrid or Munir El Haddadi at Barcelona which would give us flair and pace out wide.