Chelsea can sign players in January after having their Fifa transfer ban reduced following an appeal to the Court of Arbitration for Sport.
The Premier League side were given a two-window ban by Fifa in February for breaching rules on signing young players.
CAS halved the ban to one window, which was served during the summer.
Meanwhile Marco Silva was fired by Everton after 18 months in charge, a day after his team lost 5-2 at Merseyside rival Liverpool to slip into the relegation zone in the Premier League.
Silva’s departure was announced in a short statement by Everton, which also said that Duncan Ferguson, the club’s former striker, will take temporary charge for the league game against Chelsea on Saturday.
“The club aims to confirm a new permanent manager as swiftly as possible,” Everton said, with former manager David Moyes among those linked with the vacancy.
The thrashing by Liverpool was Everton’s ninth loss in 15 games in the league, leaving the team in third-to-last place despite its benign run of fixtures to start the season. Everton conceded four goals in the first half and could easily have lost by a heavier margin despite Liverpool fielding a weakened lineup.
Everton’s majority shareholder, Farhad Moshiri, made the decision to remove Silva ahead of a tough run of games against Chelsea, Manchester United, Arsenal and Manchester City, which could plunge the team even further into trouble.