The ex-defender, who ended his playing career at Old Trafford, complimented the Glasweigian's managerial style and praised to the profound impact that he had on his playes.
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"He wasn't on the training pitch every day but he never let anyone do the human management in his place.
"He had great players in front of him but he always saw them as his sons. I'm not surprised that Ryan Giggs and Paul Scholes are still there; the club has a family dimension."
Former Red Devils goalkeeper Barthez, who spent four years under the Scot's tutelage from 2000, echoed Blanc's sentiments but feels that the news does not come a surprise.
"For him, values like respect and humility are essential and he involved everybody on following those values," the 41-year-old remarked. "He was also very protective of his players.
"I think he planned this for two years. It is quite normal that he stops now. I'm not really surprised. It is a wise decision. He will be able to fully enjoy his time with his grandchildren."