Arsenal are set to confirm the £900,000 signing of Hertha Berlin defender Omar Rekik this week.
The 19-year-old will be the first signing of the January transfer window for Gunners boss Mikel Arteta.
Rekik is a centre back but is not expected to be part of Arteta's first-team plans straight away, due to their surplus in this position currently.
The teenager is already an international choosing to represent Tunisia through his father's heritage - rather than representing Holland, where he was born.
It is believed that Per Mertesacker, current Arsenal academy coach, had a key part in making the deal happen.