The newly-promoted Eagles have recruited eight players since winning the Championship play-off final in Maybut look like missing out on the high-profile signing of Darren Bent from Aston Villa.
Holloway conceded he was under the impression Palace had done enough to sign the England striker, who now looks set to join Barclays Premier League rivals Fulham.
The former Blackpool boss claims he cannot wait until nearer the close of the transfer window to add to his squad, with their top-flight campaign getting under way at home to Tottenham at Sunday.
"We are the ones who can't afford to wait," Holloway said.
"We have been trying to force it. The chairman has been thinking and talking about doing a big one for someone who could score.
"We have done [Marouane]Chamakh and I believe doing another who I know can score and who hasn't been picked makes total sense."
Holloway revealed he was concerned other clubs would get wind of the potential deal for Bent and entice him into a move.
"I thought there was a deal to be done," he said.
"I was very worried about it all along because if anyone came in and matched what we were going to do, in my opinion he would probably choose them.
"These other clubs can wait, they [Fulham]have got [Dimitar]Berbatov for example."