The manager promised Darwin that he would come back stronger after his nightmare debut for the club.
It could not have been worse for the summer signing from Benfica, who was shown a straight red card for headbutting a Crystal Palace defender.
Joe Cole was the only other player to be sent off in their first game for the club.
Darwin let his teammates down. He will be left alone for a night and I will talk to him tomorrow.
The awkward conversation may have been made a little easier by Luis Diaz's stunning second-half goal.
How costly was his moment of madness when he scored on his debut, but will he be able to play the rest of the season?
He was provoked but that is not how he should act.
We don't want to see it. Centre-halves will do that, but it is not a reaction he wants.
We will use the time in a productive way. We will use the suspension to strengthen him, not to punish him.
In his first season in Spain, where he made his professional debut, he was sent off once.
After scoring 32 league goals in 57 league appearances, he earned a dream summer move to the English top flight.
Jamie Carragher is worried that the young forward will have a wait before he is given a chance to impress the fans.
He will be devastated by what he's done. He let himself and the team down.
I am sure that if he had been on the field, the game would have been different. We may not see him back in full flow for five weeks now.
Gary Neville is confident that Nunez will learn from his mistake, even though he showed the kind of short fuse that will make other defenders pay attention.
He spoke on Sky Sports. He is combative in the first couple of games. The under side of the nose was where it was located.
He will benefit from that. We don't know why we react the way we do. You do things and then you wonder what you did. The mist is red.
Although he was impressed by the response from the Reds, he was concerned about the impact the suspension will have on their season.
They have dropped four points in two games and face a trip to Old United before their next game.
The start of the season has been hampered by injuries to a number of key players, including Thiago and Roberto Firmino.
The boss said that they had a difficult week. Someone pulls up on a daily basis. You wonder if there is a witch in the building.
Despite the bad fortune, the manager said he was proud of the response and praised the goal.
The void left by the departure of Sadio Mane could be filled by the 25-year-oldColombian forward.
"If this lad can get the goals he did, I think he could become an absolute super star in the premier league," said Carragher.
He is always running and has such control. The players are judged on their numbers. He has looked a top player in general, but he needs to get the goals.