The Chile global has scored one goal and registered two assists since his January switch from Arsenal, which saw Henrikh Mkhitaryan move the other way in a straight swap deal, but Sanchez is yet to hit top form in his ten appearances for Jose Mourinho's side.
"He was very fond of me and he didn't want to let me go", Sanchez said, as quoted by the Daily Mail.
Having joined Manchester United only a few weeks ago from North London giants Arsenal, Sanchez revealed that he would love to return back to Chile at Universidad De Chile to end his footballing career.
He said, "I wanted to continue growing as a player, more so as a Chilean, because it's hard to get to Man United".
"When this World Cup finishes, I think I'll be a bit calmer".
"I played for Colo Colo and the truth is that it was great and I won a lot of things with them, but I think people are going to understand it because it's a dream my dad had and god willing I am going to fulfill it.", he added, professing his admiration for his father and family.
Things have not exactly gone to plan on the pitch for Sanchez since moving to Old Trafford, he has scored just once in ten appearances, and seems to be struggling to find his role in Jose Mourinho's team. No Chilean has ever played here.
Nicholas, who played for the Gunners for five years in the mid-1980s, believes Sanchez loses possession too often - a flaw in his game which did not go unnoticed during his time at The Emirates Stadium - and has been forced into the side to the detriment of his United teammates.