Following weeks of claim and counter-claim Chelsea were charged with bringing the game into disrepute on the grounds of making false allegations.
Separate charges were issued against Jose Mourinho, Steve Clarke and security official Les Miles.
The hearing was set for 31 March but, when Chelsea received details of the charges two days earlier, they were surprised to find that the referee's report was absent.
The club contacted UEFA to ask for Frisk's report and when it arrived a day later they discovered that the Swede had backed their version of events almost entirely.
Frisk said that Rijkaard approached him on three separate occasions until he finally lost patience and told him to return to his own dressing room.
That version of events has been confirmed by UEFA's venue director, Pascal Fratellia, whose own report detailed Rijkaard's half-time meeting with Frisk.
Frisk's report subsequently became a key part of Chelsea's defence and senior club sources insist it was deliberately omitted because it undermined UEFA's case.
