Crowley was de-listed by the Dockers after serving a 12-month ban and missing the entire 2015 season after testing positive to a banned painkiller in July 2014.
Crowley’s former teammate Garrick Ibbotson says the tagger could easily slot back into the AFL with the Bombers, despite a year out of the game.
“I think he’d go alright,” Ibbotson said.
“He’s always been a really fit guy so I don’t think he would’ve lost a lot of that desire to play footy and fitness to play footy. I know that he loves to run.
“I think he’d really like the opportunity to play again.
“I think he would’ve obviously liked to play footy here if he could have. But I think playing AFL footy would be great for him again.”
Essendon can sign up to 10 top-up players for the 2016 season.