Eddie Howe said that he was close to being unable to field a full team for the trip to Goodison Park.
Due to injuries and cases of chronic bronchitis, the squad was only able to name eight replacements, including two goalkeepers, instead of the maximum nine.
They lost Allan Saint-Maximin and Callum Wilson to injuries against United.
Howe's selection problems will get worse with his fifth yellow card of the season and will sit out at Goodison Park.
Howe told Sky Sports that they were thin on the ground.
Eddie Howe says his squad is stretched out.
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Eddie Howe was very disappointed after the draw with Manchester United.
These are difficult times for us. I think it's 13 plus a goalkeeper. We are going to be close to that number.
Callum's injury looks bad. He went down with no one around him. Allan, I don't think it's serious.
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Manchester United fought back to claim a draw against a team in the bottom half of the league.
Howe has only led to one win for the team, which is second bottom of the league.
Howe later said he didn't know if the game would go ahead. We will see what the situation is with the players.
The two games that were to have been played in December have been called off because of coronaviruses.
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Sean Longstaff said that the disrespect shown towards him is a disgrace and that he is receiving recognition for his performance against Man Utd.
Longstaff can make it difficult for any team.
The draw with United might have given them three points for the second time this season, but they will still be happy with their performance.
Sean Longstaff told NUFC TV that they can make it tough for anyone when they are on the front foot.
We're not playing any of the best teams in the next run of games. We need to use this as a chance to pick up points and look up.
Every game is very important to you. It's a huge privilege to pull the top on. Everyone in the dressing room knows that and we'll put the work in over the next couple of days to be ready for it.
We have to see it as a chance to pick up points. Hopefully there's no cancellation in terms of Covid and everything else going on because it's a game where we can take positives from this one and hopefully carry that on to Thursday night in that game.
What are the rules for postponements?
A new guide explaining match postponement protocols was published after a number of games were postponed.
There are factors considered when deciding to delay a game.
The impact of COVID-19 infections on a club's squad, as well as injuries, illness and those isolating, and the number of players available on the squad list and any Under-21 players with appropriate experience are some of the things that have been mentioned. The match will be postponed if a club can't field 13 outfield players or a goalkeeper from its squad list.
The number of individuals affected, the sequence and source of infections, and their proximity to the match in question are some of the things that can be considered the status of a COVID-19 outbreak within a club.
A club's ability to prepare its players for a match.
Medical advice as to whether the health and safety of players and staff is at risk if they play the match.
The UK Health Security Agency can give advice.
Any other circumstances that are exceptional.
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