With Aloisi now unable to guarantee the 36-year-old playmaker a contract for next season, Broich is looking elsewhere to continue his decorated career, much to the dismay of fans who felt more should have been done to keep the two-time Johnny Warren Medallist in Brisbane.
Oar admitted it would be a huge task to permanently replace Broich, a two-time Johnny Warren Medal victor and three-time A-League champion, on the left wing.
An off-field role with the Roar for Broich had apparently been discussed, but Aloisi says salary cap pressure next season means they are not in a position to offer the 36-year-old a new deal as part of their player roster.
On Wednesday, Roar's football operations manager Craig Moore said keeping Broich - who would have had to move under the salary cap next season - could have cost the club a player for the future like midfielder Joe Caletti.
"At the beginning of the season and halfway through the season he wasn't sure if he wanted to play on but just a couple of weeks ago he decided that he did".
"If we can get over 30,000 there for the game and make it an occasion, a spectacle, everyone will remember that day and that will help us get over the line against a good Wanderers side", he said. There's a lot of things that are very hard to explain to the general public what goes on behind closed doors.
"But Thomas Broich, for me, has been a dream to coach".
"Normally I would be helping young players a lot but after a couple of games I nearly don't need to help him anymore", the former Danish global said. "I think that will continue on past this season".
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Brisbane Roar boss John Aloisi has lauded outgoing star Thomas Broich's attitude ahead of their make or break elimination final against Western Sydney Wanderers at Suncorp Stadium on Friday night.
Aloisi wasn't willing to get into the details of why Roar were unable to retain Broich.
"He's not really focused on the fact this might being his last game", he said.
Aloisi praised Broich's professionalism in the build-up to the play-off encounter.
"I spoke to him yesterday afternoon, gave him a call to see how he was and he said "I'm preparing exactly the same like I would any other game" and that's all I wanted to hear".
Roar - who finished third behind Sydney FC and Melbourne Victory - will need to win three straight matches, including potentially two in a row away from home, to become the first club to lift the Championship trophy on four occasions.
Western Sydney's Jack Clisby feels despite the Wanderers' poor record versus Brisbane, they can certainly turn it around.