Arsenal will fill the void with Berta after Edu Gaspar's departure before Christmas.
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Arsenal have reached terms with the Italian, who is a free agent after leaving Atletico Madrid last month.
Berta had been with Atletico for over 12 years, but chose to terminate his contract six months early after being sidelined by a management restructure.
The Athletic says Berta and Arsenal have reached terms over him taking the technical director's post. He has chosen the Gunners ahead of offers from across Europe.