Arsenal will not complete any more transfer business this summer.
"He (Lacazette) is the priority, I think nothing can happen without sorting out the Sanchez and Ozil situation, that's the problem," Laurens said on ESPN FC.
"That's why I think people at the club are maybe getting a little bit frustrated.
"If nothing happens with Sanchez and Ozil, the rest of the business can't be done, they need to sort that out.
"Whether they stay or go, they need to sort that situation out before thinking about signing other players or even selling other players."