After his loan return from Darlington , he played until May 2013 and then left Sunderland after refusing a new contract .
Thomas served as an apprentice at Sunderland after leaving Newcastle United in 2011 , and played in December 2012 one month on loan for Darlington .
After Thomas ' loan return Darlington Darlington , Thomas played until May 2013 and then Sunderland Sunderland after refusing a new contract .
Thomas served as an apprentice at Sunderland after leaving Newcastle United in 2011 , and played in December 2012 one month on loan for Darlington .