Adkins is ready to dip into the transfer market after the Championship side were embarrassed 6-0 by League One high-fliers Peterborough in a London Road rout.
He saw wholesale changes to his starting line-up backfire as hat-trick hero Lee Tomlin lead an onslaught that earned Darren Ferguson's men claimed a sixth successive victory at the start of this season.
Adkins said: "Peterborough deserve a lot of credit for their performance, but that produced by my players was not acceptable.
"We came here with the desire of progressing in the cup but have gone away with a very heavy defeat despite having seven or eight internationals on the pitch.
"This game is about scoring at one end and keeping the ball out at the other. Here we did neither of those things and I can only applaud our travelling supporters because it was not a nice night for them.
"It was a rude awakening for a lot of players and they know there will be consequences.
"There are a few days left in the transfer window and I will be speaking to the owner on Wednesday."