Saif Rubie is on trial over an email he sent to Marina Granovskaia in May 2022.
Manchester City were the second-highest spenders in the top flight.
Chelsea are ninth in the Premier League but just five points adrift of sixth-placed Manchester United with a game in hand.
Despite United's struggles, Chelsea boss Pochettino is adamant they remain a side to be feared.
Chelsea's players are struggling to find answers for their poor run of form this season, Raheem Sterling said, but the attacker maintained that the Premier League club can turn around their fortunes under the right manager.
Graham Potter earned his first win as Chelsea manager after Conor Gallagher returned to haunt Crystal Palace with the decisive goal in a 2-1 victory at Selhurst Park on Saturday.
Pierre-Emerick Aubameyang could make his debut for Chelsea in Tuesday's opening Champions League group game at Dinamo Zagreb despite suffering a fractured jaw during a home invasion.
Chelsea manager Thomas Tuchel said he understands defender Cesar Azpilicueta's desire to join Barcelona, but added that the Premier League club will not allow him to leave for a cut-price fee.
Cristiano Ronaldo faces an uncertain future after the Manchester United striker's attempt to force his way out of Old Trafford failed to spark the expected rush for his signature.
Chelsea are answering every test of their credentials, manager Antonio Conte said as their seemingly unstoppable march towards the Premier League title continued with a 3-1 win against Bournemouth on Saturday.
Chelsea playmaker Eden Hazard believes the club are inching ever closer towards the Premier League title but remains wary of getting too carried away as there are still plenty of points up for grabs.
Chelsea manager Antonio Conte got the upper hand on Jose Mourinho for the second time this season as his double-chasing side beat 10-man Manchester United 1-0 at Stamford Bridge to reach the FA Cup semi-finals on Monday.
Chelsea brushed aside London rivals West Ham United with a 2-1 away win that restored their 10-point lead at the top of the Premier League on Monday.
Cesc Fabregas is not one to shy away from a challenge and the Chelsea midfielder says he will bank on his experience to nail down a first team spot after making his 300th Premier League appearances in Saturday's 3-1 win over Swansea City.
Diego Costa has been dropped from the squad of Premier League leaders Chelsea for the match at champions Leicester City after a row over his fitness, according to media reports on Friday.
Antonio Conte has dismissed complaints of his rival managers over Chelsea getting a longer rest during the festive period and said they are angered by his side's position at the top of the Premier League table.