Just two weeks after confirming the Port Adelaide premiership player would be playing on for a 13th season, GWS have decided to cut Brogan from their list, although they could still re-draft him in either the AFL draft or pre-season draft.
Giants general manager of football Graeme Allan said the outcome of next week's AFL Commission hearing involving Adelaide and Tippett would play a major role in their plans for the draft.
"We obviously respect the AFL Commission hearing and await their findings. We also want to see the terms on which Kurt Tippett will nominate for the draft," he said.
"We are naturally interested in a player of his calibre but a decision on drafting him will also be determined by affordability and with respect to the process outlined by the AFL."
Allan also confirmed that Brogan would continue his role at the club as an assistant coach.
Former Essendon players Brent Prismall and Rciky Dyson will be looking to find new clubs via the draft after they were delisted by the Bombers on Tuesday.
The Bombers had given the experienced pair two weeks to train after the club's first list lodgement at the start of November, but it appears neither did enough to win a spot on the list.
"We would like to sincerely thank both Brent and Ricky for their contribution to the Essendon Football Club," Bombers football manager Danny Corcoran said.
"It is a difficult time of year but we wish them both every success in the future."
Dyson, 27, spent nine seasons at Essendon for a total of 114 games with a series of injuries preventing him from playing more matches.
Prismall, 26, joined the club from Geelong at the end of 2008, but was also hampered by injuries with a second knee reconstruction and numerous hamstring issues limiting him to just 36 senior games in four seasons.
Essendon also delisted young forward Ariel Steinberg, but the club have guaranteed the 20-year-old a spot on the rookie list for next year.
Meanwhile, Melbourne have secured the services of former Geelong defender Tom Gillies on the final day of the AFL delisted player free agency period.
The 22-year-old managed just 13 games in four seasons at the Cats as he struggled to land a senior place behind accomplished defenders Matthew Scarlett, Harry Taylor and Tom Lonergan.
"As a big-bodied, tall defender, Tom fills a need within our playing group. Having been part of the AFL system for four years and entering his fifth, we believe Tom has a lot to offer the Melbourne Football Club," Melbourne general manager of list management Tim Harrington told Melbourne's official website.