News that Danny Fox is on Burnley's radar has prompted speculation Celtic are in the market for another left-back.
"Everyone has a price," Laszlo said of Wallace, who was linked earlier in the season with a move to Ipswich.
"But the decision must be from the board and the player."
Laszlo was forced to sell captain Christophe Berra to Wolves a year ago after they matched Hearts' valuation.
"He had the price and they paid this and he moved," the Jambos boss said.
"Definitely from my personal view, if Lee Wallace moves, I am not very happy about this, as he is a very important piece of this squad and he has improved."
Laszlo finally made a signing on Monday after Darren Barr agreed to join Hearts on a pre-contract.
He added: "Lee is a good and professional player but we talk about Barr before and why he would like to come here because he's sees the chance to improve - with Lee Wallace it is the same."
Laszlo expects Wallace to be in the team for Wednesday's game with Aberdeen and Saturday's match at St Johnstone.
He said: "Definitely I plan against Aberdeen with Lee Wallace, and also against St Johnstone."
Hearts v Aberdeen. Click here to bet.
Source: Team Talk
Source: Team Talk