Lambert has money to spend during January on possible newcomers and believes club owner Randy Lerner's investment in Villa should not be underestimated during his six years in charge.
The Villa boss said: "I always speak to Randy. I've always had a good relationship with him.
"If you look at the years he's been here, I don't know how much money he has put in but it's a lot of money.
"If a couple of players come in during January, then great. But you can't fault Randy for what he's done for this club, that's for sure.
"January always gives you an opportunity to bring people in.
"We have conversations all the time and it would be wrong for me to say there is 'X' amount available.
"You can work with what you've got and if one or two come in, then great."