The Red Devils have endured a difficult campaign thus far and sit sixth in the Premier League, four points behind fourth-placed Manchester City, though they are still active in the FA Cup and, following their exit from the Champions League, the Europa League.
Their next three games, across a week, are set to define their season, with United facing West Ham in the quarter-finals of the cup, Liverpool in the Europa League and City in the Premier League.
United's 2-0 loss to the Reds in the first leg of their European encounter piled the pressure on the Dutchman, but he insists he does not need to be evaluated by the club's board, claiming he will assess his own performance at the end of the season.
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"I am always evaluating myself so that is not a problem. But I cannot discuss this question with you at the moment," he told reporters.
"The FA Cup can save the season, the Europa League can also save my season, and a position in the top four can also save my season.
"It is still possible. It is very difficult, I know that, but it is still possible. Now, when you lose a game, it is a disaster. But this is a sport where you can lose and you can win.
"I have been told by the media that I am getting the sack for the last three months. But I am still in three competitions – and a lot of colleagues cannot say that at this stage of the season."