The 52-year-old has already announced he will leave the La Liga giants at the end of the season and he is well-regarded having helped Atleti when two league titles during his time in the Spanish top-flight. If he was offered the job, Berta would be tasked with improving United's success in the transfer window and back 2019 he was named sporting director of the year at the Globe Soccer Awards for the work he had done at Atletico Madrid.
Here are a look at some of his best transfer deals:
We start with arguably the best bargain buy of the lot. Atletico only paid a small fee for Gimenez and helped transform him into one of Europe's best defenders at his peak.
1. Jose Maria Gimenez from Danubio FC, 2013/14 - £896,000
We start with arguably the best bargain buy of the lot. Atletico only paid a small fee for Gimenez and helped transform him into one of Europe's best defenders at his peak. | Getty Images
A smart buy. Villa won the La Liga title and reached the Champions League final in his solitary season with the club.
2. David Villa from Barcelona, 2013/14 - £1.89million
A smart buy. Villa won the La Liga title and reached the Champions League final in his solitary season with the club. | Getty Images
It was a huge fee but Griezmann became one of the best players in world football during his first spell with Atletico Madrid.
3. Antoine Griezmann from Real Sociedad, 2014/15 - £48.6million
It was a huge fee but Griezmann became one of the best players in world football during his first spell with Atletico Madrid. | Getty Images
Atletico picked up another bargain when they signed Oblak from Benfica. He has given them almost a decade of service and has long been one of the very best in the world.
4. Jan Oblak from Benfica, 2014/15 - £14.4million
Atletico picked up another bargain when they signed Oblak from Benfica. He has given them almost a decade of service and has long been one of the very best in the world. | Getty Images