DAVID MOYES expects Jordan Pickford to develop into England 's long - term number one .
DAVID MOYES admits Sunderland will struggle to hold on to the highly - rated goalkeeper if he continues with his current rate of development .
DAVID MOYES expects Jordan Pickford to develop into England 's long - term number one , but admits Sunderland will struggle to hold on to the highly - rated goalkeeper if he continues with his current rate of development .