Villa head into the final two weeks of the season three points above the bottom three, albeit with a game in hand on all three teams in the relegation zone.
Lambert has been able to spend on a limited basis in the last couple of summers, with Christian Benteke proving a very shrewd signing in 2012, but he is looking to make a big splash this summer if given the money to do so.
The Scot has been linked with moves for Manchester United striker Javier Hernandez, Manchester City defender Joleon Lescott and Tottenham midfielder Lewis Holtby and he said: "I think a football club of this size needs that calibre of player.
"I'm not just talking about those three lads because it would be wrong for me to talk about them but we need that level of player for the size of this club, wherever they come from. This club needs big players.
"It's not acceptable for this club to keep doing this, it's been four years of battling against relegation. It's too big a football club to do this. That's the reality. I think everybody knows that."
But Lambert admits he has no idea what kind of budget he will have to spend on his squad this summer, as rumours continue over Randy Lerner's long-term commitment to the club.
"The chairman will come out and say what he's got to say in May time, I think. I don't know what he's going to say and that's me being totally honest with you," he said.
"This football club, with the tradition and history it's got, should not be fluctuating like this. You are where you are.
"The chairman will come out and be honest with everybody. It's his football club and I don't think anyone can ever be critical of what he's done for this club.
"There's no way anyone could do that and I'm pretty sure he'll say what he's got to say. I'm not breaking ranks. I'm just saying that a club this size needs to be up there competing.
"I know the situation and Randy will say what he's got to say. I think he's been fair with everybody about exactly what's happened and he'll speak when the time is right."