Jose Mourinho's side suffered an unfortunate 1-0 defeat at St James' Park, with Matt Ritchie's 65th-minute goal being the only thing separating the two teams.
Other results over the weekend, especially Manchester City's crushing 5-1 victory over Leicester City made things all the more bitter for Red Devils. United now just have a two-point lead over third-placed Liverpool.
In his weekly blog, Mata wrote: "It's not easy to write after a defeat. The truth is, after losing an away game you think a lot about it on your way back home," quoted Sports Mole.
Juan Mata tells Man Utd team-mates they should be 'raging' about Newcastle defeat https://t.co/LwHWd9u6ju— Telegraph Football (@TeleFootball) February 13, 2018
The Spaniard continued, "You remember every play, every moment, and you try to change the outcome but obviously that's impossible. You can't turn back time, so the only way to carry on is to turn all this rage into a desire to win, work and attitude for the next game."
Talking about missed opportunities, Mata claimed as he concluded, "The 1-0 in Newcastle hurts because we had chances to score both in the first and in the second half, but they took better advantage of their weapons."
Manchester United return to action with an FA Cup fixture against Huddersfield, this Saturday.