(CNN) Special counsel Robert Mueller's team could reveal tantalizing new details in its investigation into possible Russian collusion on Friday thanks to a pair of court filing deadlines involving President Donald Trump's former campaign chairman Paul Manafort and former lawyer Michael Cohen.

Mueller's office has a Friday deadline to explain to the court why it accused Manafort of lying to investigators and breaking his cooperation deal. Separately, the special counsel's office and federal prosecutors in New York have to provide memos to recommend a sentence for Cohen -- filings that are expected to detail how he has cooperated in multiple investigations.

The memos from Mueller come the same week that the special counsel's office said in court Tuesday that former Trump national security adviser Michael Flynn provided "substantial assistance" to the special counsel's office and should not receive jail time.

In addition, former FBI Director James Comey is testifying behind closed doors on Friday before the House Judiciary and Oversight committees for a Republican-led probe into the origins of the FBI's Russia investigation. Also Friday, George Papadopoulos -- the first person to plead guilty in the Mueller probe -- is being released from prison after serving a two-week sentence.

It all adds up to one of the busiest weeks in the 19-month Mueller investigation -- and potentially one of the most revealing.

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