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He'd be lucky to make the match day squad. by NDMike2001
The current starting 11 is nearly a constant.
Mane - Firmino - Salah
Milner/Shaqiri - Hendo/Fabinho - Gini
Robertson - VVD - Gomez - Trent
Alisson
Mignolet, Shaqiri/Milner, Fabinho/Hendo, Origi, Sturridge, Keita and Lovren
That squad doesn't include Lallana, Matip and Ox.
So yes, if your post assumes that Reyna is better than Fabinho and Keita, then he would improve Liverpool. I think that Fabinho is a better player already, and that Keita will after he adjusts to the system.
It would be really hard to strengthen the starting 11. Sure, you could replace some very good players with world class players. A Hazard could go into the front line for Mane. A KDB and/or Silva could go into the midfield. Kante would be an upgrade for Fabinho. A Koulibaly would upgrade Gomez.
Any talk of transfers would most certainly be someone who would provide depth and or help challenge for starting spot.