Liverpool boss Brendan Rodgers will not waste his transfer war chest on desperation signings.
"They have to be of the right quality, that's the bottom line," he said.
"We've got money to spend on getting that quality in but if it's not available I won't waste it for the sake of bringing a player in.
"We're really working hard to bring in the type of profile that can really help us push on.
Rodgers is more than happy with the quartet he has already signed, having brought in Sunderland keeper Simon Mignolet, Manchester City defender Kolo Toure, Celta Vigo's Iago Aspas and Sevilla's Luis Alberto.
"All of the new boys have settled in really well," he told LFC TV.
"Simon Mignolet has been first-class. He has shown that he is one of the top young goalkeepers in European football.
"I think he will prove over the next coming years at Liverpool that he is a top goalkeeper.
"Kolo Toure speaks for himself - his experience and his fitness has been first-class since he came in and he's a really good man.
"That was the idea of bringing him in, because of his winning mentality and his personality.
"Iago has settled in well and got a few goals in pre-season, which is great for his confidence. He's a livewire in and around the box.
"Luis Alberto is obviously still young but has shown the qualities, technically, and has got a strong mentality.
"I think we can see early on that he can end up being a very good player for Liverpool."