Songo'o is desperate to make Cameroon's World Cup squad and is struggling for first team action at Zaragoza.
He told Foot Mercato: "I do not know yet what I'll do. I must play to go to the World Cup. I spoke with Paul Le Guen (Cameroon coach), and I have to play regularly if I want to go. So I'd like to go elsewhere to play.
"I know the club has refused several proposals. But there are a few more days so anything can happen very quickly."