Collins has been linked with Stoke City and Zola said the fact he had defensive options could persuade him to offload the 26-year old.
"There's an interest in him (Collins) from another team, but that's all I know," Zola said.
"In defence we have eight players I can choose from. In attack, I can only choose Carlton Cole or myself. We have two young players who are doing well, but they need time."
"I don't think West Ham are his only potential destination. There are a few teams after him," he added.