Bonser has not attended a home game in almost three seasons, and has made clear his intentions to sell the club.
But despite fierce criticism from supporters, Gamble insists the chairman has not lost interest in the Saddlers.
Gamble told the Express & Star: "Jeff's heart and soul is still in the club. He still wants the club to do well as he always has done.
"That's why he got involved in the first place - that hasn't changed and it never will.
"The club is for sale, as it has been for some time. The chairman has made it pretty clear he is happy to sit down with anyone as long as they can prove there are unencumbered funds to follow through but, importantly, that they have the interests of the club at heart."
The chief executive also believes Dean Smith's men can arrest a run of form which has seen them fail to win any of their last 14 games in all competitions.
He said: "The fact we haven't won for 14 games is an immediate concern. We're in a rut at the moment but generally the performances are still decent and we're making chances. It will come right."