Middlesbrough boss Aitor Karanka has vowed to send Calum Chambers back to Arsenal a better player than when he left.
The 21-year-old England international arrived at the Riverside Stadium on a season-long loan deal as the summer transfer window drew to a close having found himself surplus to requirements at the Emirates Stadium.
However, Karanka is convinced a man who cost the Gunners £16 million when he moved from Southampton two summers ago will return to North London having benefited from his time on Teesside.
Asked if Chambers had something to prove, the Spaniard said: "He has come here to help us.