Dallas Cowboys quarterback Dak Prescott has taken to social media to apologise for comments he made about the officials following their last-gasp 23-17 playoffs defeat to the San Francisco 49ers.

Prescott felt he had spiked the ball in time to get one more shot at a game-winning touchdown in a bizarre ending to their Wild Card round loss.

The officials ruled that Prescott had not spiked the ball in time, as NFL rules state the ball must be spotted by an official which umpire Ramon George attempted to do, colliding with Prescott and Tyler Biadasz causing a delay that prevented the QB from getting a Hail Mary away.

Prescott was asked after the game about fans throwing objects at the officials, to which he replied: "Credit to them, credit to them."

However, the Cowboys quarterback apologized for those comments on Tuesday via a Twitter post.

"I deeply regret the comments I made regarding the officials after the game on Sunday. I was caught up in the emotion of a disappointing loss and my words were uncalled for and unfair," Prescott said.

"I hold the NFL Officials in the highest regard and have always respected their professionalism and the difficulty of their jobs. The safety of everyone who attends a game or participates on the field of a sporting event is a very serious matter.

"That was a mistake on my behalf, and I am sorry."

In his pool report after the game, referee Alex Kemp insisted umpire George had done everything correctly in spotting the ball.

The referees association posted on Tuesday via their official Twitter account: "The NBRA condemns the comments by Dak Prescott condoning violence against game officials.

"As an NFL leader, he should know better. We encourage the NFL to take action to discourage this deplorable behavior in the future."