The midfielder became Arsenal 's first outfield signing since January 2014 , following Gabriel Paulista 's arrival .
Manager Arsene Wenger sung the 23 - year - old 's praises following his move to the Emirates .
The midfielder became Arsenal 's first outfield signing since January 2014 , following Gabriel Paulista 's arrival , and manager Arsene Wenger sung the 23 - year - old 's praises following his move to the Emirates .