Villa have so far splashed out more than £75million on Ollie Watkins, Matty Cash, Emiliano Martinez and Bertrand Traore.
Assistant boss Terry believes their arrival can help take the team to the next level.
He said: “Already we’ve seen that, the immediate impact in the first couple of games. What it does is training goes to another level.
“Everyone is pushing each other. The right-backs are fighting for their spot, the left-backs are doing the same. Ollie’s came in and set the standard. Keinan (Davis) looked superb at Bristol as well.
“All over the training ground the levels go up. You can only match those levels, if you don’t hit them you fall behind. What we’ve seen so far is everyone’s rising to that level and pushing each other.”
Striker Mbwana Samatta has completed his move to Fenerbahce.