Really? That seems very unlikely given the quality of our starting players and the fact that Haland is 5 years Minamino's junior. Don't get me wrong I'm really excited that we've signed Minamino and feel he'll be a great addition to the side, but more impactful is a massive call. Be careful when judging Japanese players, they can be found out when they transition to more physical leagues, as the Japanese football system is very low contact/tackling.
Which is good that he has proven himself in the Austrian league and in the Champions League as well...
To me, the most important thing about who we sign is who we need, and the greatest need for a long time now has been an alternate or substitute and understudy for Firmino. We simply do not have any such player in our existing squad and truth be told, there are few such players of sufficiently high standard of quality in the whole of Europe. Minamino may be the first such player to emerge, and it show show great our need is for such a player and how decisive is the Liverpool management is to swoop swiftly for him.
The fact that he is available for the frankly incredibly low (by current standards) sum of 7.25 million GBP and that he is even able to play in the CL for this season makes signing him now a no-brainer.