After a poor season and being dropped to the youth team, Owusu went for a one-week trial for Chinese Super League club Guangzhou Evergrande. Owusu failed to make an impact at Adelaide and had his contract terminated by mutual consent at the end of December 2010. He quickly returned to England to join League Two club Port Vale on trial. Port Vale wished to sign him in early January 2011, but came up against registration issues with Adelaide. New manager Jim Gannon then said that he would not be signing Owusu.