They had hoped he would be available for seven matches between those two commitments, but Brook pulled out of the tournament due to workload.
“Naturally we are disappointed that Harry has withdrawn from the Australian Football League, but we understand his decision as his workload increases,” Melbourne Stars general manager Blair Crouch said.
“Given that Harry is set to miss the first three matches, the club have already signed a replacement player for that period.
He added: “Currently, the technical staff and the list management team are discussing the options available for the rest of the tournament, and we look forward to announcing those contracts as soon as they are finalized.”
This is the second year in a row that one of the top two picks in the overseas draft has withdrawn from the tournament after Liam Livingstone withdrew last year after being the Melbourne Renegades’ No. 1 pick in the inaugural overseas draft.
The BBL starts on December 7 and ends on January 24.