Blackett has signed a new contract at Manchester United which keeps him at the club until at least June 2017, with an option to extend for a further year.
United boss Louis van Gaal said: "I am delighted that Tyler has signed a new contract. He is another young player that has risen through the Academy system to break into the first-team squad this season. Tyler has great potential and I believe he is at the right club to continue his development and progression to become a great defender."
Blackett added: "I'm thrilled to have signed my new contract. I have supported United all my life and have been here since I was eight years old. To come through the Academy and make my debut this season was a dream come true. I want to keep improving within the first-team squad with the help of the manager, coaches and the players around me."
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