United revealed on Saturday that the Netherlands international is set to join the club, with Ajax announcing the fee to be £13.8 million.
And on Sunday, Blind - who impressed for his country at this year's World Cup under now-United boss Louis van Gaal - has all but confirmed his switch to Old Trafford with an emotional post on his Instagram account.
"Want to thank everyone for the wonderful years I've had from my 7th [year] to 24th!" he posted.
"Supporters, team-mates, staff, thanks! Ajax remains my club."
Blind won four consecutive Eredivisie titles in Amsterdam.
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