"Bring your scarves, your banners, your flags, bring everything you've got. Because we will, and we can't do it without you," Bradley says in a club video posted Friday on YouTube.
Toronto (9-11-7) hosts lowly Chivas USA (6-16-6) on Sunday. TFC is winless in six (0-4-2) and has won just three of its last 16 (3-7-6) as it slips down the Eastern Conference standings.
"There will be only seven games left in the season and I knows what's on the line. We all do," Bradley says in the video. "You've been there all year long. I've seen you, I've heard you. But this Sunday we need you more than ever ... Together we can fight through this."
Bradley made himself available to reporters Wednesday after training to make a similar plea.
Selling tickets has not been an issue for Toronto FC. Despite its recent slump, it has had a string of sellouts. But despite the announced full house last time out, there were still plenty of empty seats for a home loss to the Philadelphia Union. And on Tuesday the club plans a groundbreaking ceremony for its stadium expansion plans.