Manchester United, traveling to north London to take on Arsenal, is already eight points behind Manchester City.
Manchester United boss José Mourinho fears losing out-of-contract Fellaini at the end of the season, but many more big players may depart if he doesn't secure deals quickly.
Owner Mike Ashley wants to sell after 10 years in charge.
The Spanish club is used to showing its financial might in the transfer market.
The league leader is looking to get even stronger in the new year.
Arsenal hosts Mauricio Pochettino’s team at the Emirates Stadium.
Many regard it as the most exciting league in world football.
The Frenchman has been manager at the club since 1996.
The window reopens for a month at the beginning of the new year.
The Portuguese coach’s agent has reportedly been speaking to another club.
The club has a few players with contracts expiring at the end of the season.
Chelsea beat Manchester United 1-0 on Sunday but the Brazilian watched from the stands.
Jose Mourinho returned to the stadium where he won three Premier League titles.
Arsene Wenger has wanted the French midfielder since last season.
The Manchester United manager is already considering the signings he wants to make in January.
Zinedine Zidane’s Real Madrid travel to London on Wednesday for the Champions League clash at Wembley.
Arsenal travels to the Etihad Stadium, where Alexis Sanchez may wish he'd moved to.
Manchester United may have had a good start to the season, but life isn't all sunshine and rainbows at Old Trafford.
The French midfielder has been sidelined for six weeks with a hamstring injury.
Both Premier League clubs are planning to bolster their squads in January.