They are top of the league at this time of year.
Being top at Christmas is seen as a good sign for a team's title chances because fewer games are played by that point.
Fourteen teams have failed to win the premier league since 1992 after being top at christmas
The World Cup break will see a five point lead over Manchester City for second place.
The World Cup may hurt Manchester City.
Manchester City have the most call-ups of any side in the league.
The number of players from Manchester City called up for the World Cup is more than the number from the other team.
Predicting who will win the World Cup is difficult, but City's players usually play for countries that are likely to go far in the tournament.
Five of the 15 players who play for Manchester City are from England and three are from Portugal.
Manchester City might have been affected by all these call-ups, with some pundits suggesting that the players had their minds made up when they lost to Brentford.
Gabriel Jesus and Gabriel Martinelli are two players from Brazil who have a good chance of winning the World Cup for their country.
There are four players from teams with less than 1% chance of winning, and one from a team with between 1% and 5% chance of winning.
With this in mind, head coach Mikel Arteta will have more first team players to work with during the training camp in the United Arab Emirates.
The cross-city rivals are in the same situation. Twelve of the 14 United players at the World Cup are from teams that are likely to make it to the knockout stages.
There are just five players at the World Cup for the other team. Eddie Howe's side have got off to a great start this season, but often sides outside the Big Six have less squad depth and start to fall away later in the season as fatigue and injuries take their toll The World Cup break could giveNewcastle United a chance to rest and refresh so that they don't suffer as much fatigue as the season goes on.
There aren't many players at the World Cup forLiverpool. There are seven call-ups for their side. In the second half of the season, having so few players at the World Cup could make a difference.
The World Cup will give teams in the league a chance to recover from a busy season, so that they are ready to go again at the end of December.