The 29-year-old Borussia Dortmund defender is due in London next week for a medical as he completes his £16m transfer to north London.
Speaking to radio station 24/7, Sokratis father Charalambos Papastathopoulos lifted the lid on the machinations surrounding his son’s departure from Germany.
“There was interest from United but he had to wait until July for them.
“United have a very good relationship with Dortmund, the teams talked but Sokratis chose to go to Arsenal.
“Arsenal had talked two years ago but I don’t know why he didn’t sign.
“He is going to a higher level, the world’s most competitive league and I believe he will do very well.
“Sokratis is in his last year at Dortmund. This was a major reason [for completing the move].
“I think he is going to a higher level. the world’s most competitive and I believe there will go well.”
Arsene Wenger was a keen admirer of the Greece international, but failed to agree terms with Dortmund and turned to Shkodran Mustafi, 26, instead.
Sokratis is expected to sign a three-year deal with Arsenal as they look to rebuild followed the Frenchman’s departure from the club.