Liverpool boss Jurgen Klopp wants the club to remodel other areas of their team.
The Reds have successfully revamped their forward line with the purchases of Diogo Jota, Darwin Nunez, Cody Gakpo and Luis Diaz in recent years.
Now Klopp wants them to turn their attention to the midfield and defense.
When asked about how much he can spend, Klopp said: "It's nothing to do with names or players. John [W. Henry - owner - saying the club must spend responsibly] is right.
"The players we brought in last couple of transfer windows, Luis, Darwin and Cody, players in the first line. Sadio, Bobby and Mo were for a while best front line in football. Mo is now left pretty much, and Diogo [Jota] came in as well in that time. That's investment.
"This same kind [of future investment] needs to happen next."