The CM playmaker is probably my favourite player in football; so I like keeping an eye out for such players. It's also my great wish that Klopp brings in such a player - just what we need to complement Can's fight and Henderson's running in midfield.
Except there aren't very many coming through at the moment. Brozovic is one; though at this stage, he's just a prospect. I doubt he'd be able to contribute even for us straight away, let alone Barca. Neves is stated to be one, as is Tielemans, but they're way too young at the moment. I had high hopes for Adam Maher at PSV, but I haven't seen him play or read much about him recently.
Verratti and Koke are obviously the leading lights for that position presently, but they're surely out of our league - destined for Barca/Bayern.
That only leaves Gundogan who we have a shot at - given that he has only 18 months on his contract, and the Klopp connection - that said, he's bound to attract interest from the likes of City, Chelsea, United, Juve etc. So don't see why he'd choose us unless he really loves Klopp. He'd be great though - Henderson, Can and Gundogan would certainly be a potential title-winning midfield.
Other option I can think of is somehow getting Modric if Madrid want to get rid of him in a year's time.