The move is now dragging on over a fee for the midfielder.
"[Coach] Arsene Wenger looks after their interests and it is Arsenal who control the situation. Cesc signed for many years and now he has to play them. If Barcelona want to buy him, you have to pay [for him]," the 64-year-old said at a presentation of a shoe store in the Catalan resort of Platja d'Aro.
"When you sign for a club, you are bound to it. Arsenal are the master of the situation. It is logical to want [him] to come here, but he is under contract with another club.
"I have no idea whether he will come. What I know is that they are asking for a lot of money. We must use our heads."