Despite rumors of the Belgian international joining Real Madrid, the Chelsea coach wants to hold onto him.
The US international signed with Chelsea in January but was immediately loaned back to Borussia Dortmund to finish the season.
Manning has offered multiple reasons for refusing to testify, but fundamentally says she considers the whole grand jury process to be unacceptable.
A statement on Chelsea's website said the game had raised $4 million for charities.
From reigning champions City to contenders Liverpool and struggling Manchester United, everyone will be eyeing improvement.
Assange, 47, was removed from the embassy last month after seven years as the Ecuadorian government withdrew his asylum protection, and was arrested for breach of bail conditions.
The Belgium forward has just a year left on his contract and The Blues are understood to be holding out for £100 million.
The Belgium forward is still expected to join Real in a big-money move this summer, but his Brazilian teammate Willian continues to hope otherwise.
Chelsea beat Eintracht Frankfurt in penalties, while Arsenal's path to the final was more straightforward, beating Valencia 4-2.
The support group, Sparrow Project, said in Thursday's statement that Manning was released after 62 days.
FIFA found Chelsea guilty of 29 violations of transfer rules designed to protect minors from trafficking.
Frankfurt, who are challenging for a top four spot in the Bundesliga and held Chelsea to a 1-1 draw at home last week.
Sarri brought Jorginho with him from Napoli in the close-season having identified Chelsea's midfield as a weak link.
A three-time winner of the competition with Sevilla, Unai Emery is on course for another Europa League final in his first season at Arsenal.
It all started so well for Sarri as Chelsea kicked off the season with an 18-game unbeaten run in all competitions.