Commitment from Sidlow boosts Bulls
The front-row arrived from Salford City Reds last season and scored five tries in 19 games.
Bradford – who start their Super League season against Castleford Tigers on Sunday – will find out this week if they are to receive a points deduction for entering administration.
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Hide AdBut Sidlow, 26, said: “Despite what has gone on over the past couple of months off the field, I would not change a thing.
“A big thanks must go to Francis (Cummins) as he gave me the initial opportunity and helped me gain a new deal, which I badly wanted.
“This is such a massive club and it is an honour to play here.
“I’d like to think my best years are still ahead of me and I still feel as though I am progressing as a Super League player.”
England prop Garreth Carvell seems set to leave for Hull FC just months after signing from Warrington Wolves.