I know some have a good knowledge of European football but other than someone of Mbappe's quality who else could come into this team and add something to it?
There are lots of quality young players around the other leagues. It all depends on whether you want someone who is the 'finished article' or a cracking young talent that Klopp can slowly integrate into the side.
I'm assuming you're talking about offensive players given that you mention Mbappe.
Some more 'well-known' players:
- Timo Werner
- Jadon Sancho
- Thorgan Hazard
- Lautaro Martinez: at Inter, been watching them since Lukaku moved there (I'm Belgian) and quite like him
- Kai Havertz
Some lesser-known players:
- Jonathan David (AA Gent)
- Krepin Diatta (reminds me a lot of Mane - Club Brugge)