The veteran manager has Boro only five points away from a playoff spot in the Championship.
Warnock helped the team avoid relegation last term, and now will be looking to get them back into the Premier League.
The 72-year-old should be at the club until June 2022, if he sees out the new contract he has signed.
Warnock is in his 20th year as a manager, and has managed over 1,500 games over 18 different teams in various divisions.
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