Speaking to Entertainment Weekly, Bob Daily explained that Bree (Marcia Cross) will hire Green's character Keith to decorate her house.
"Bree has an instant physical attraction to him," he said. "But then over time it turns into something more."
However, he added that new arrival Renee (Vanessa Williams) will also be pursuing Keith.
"Suddenly by episode four they're both going after him," he said. "So there's a little competition for Brian Austin Green."
Green will first appear in the seventh season premiere of Desperate Housewives on September 26 on ABC.