The Polish goalkeeper has accused Fergie and Manchester United of treating him like “a slave” and blocking his attempts to leave the Premier League champions.
Kuszczak is desperate to find a new club after falling down the pecking order and finding himself frozen out by Fergie.
The arrivals of Anders Lindegaard and David De Gea in the last 10 months and the emergence of Ben Amos have relegated Kuszczak to United’s fourth-choice keeper.
He has not made a single appearance this season and his last start for Fergie’s men was in May. But despite demanding to leave, Kuszczak claims Fergie has refused to let him go and is ruining his chances of making the Poland squad for next summer’s Euro 2012.
Leeds attempted to sign him last week on loan, but United blocked the deal.
In an astonishing attack on the United boss, Kuszczak, 29, said: “I’ve talked to Sir Alex Ferguson recently.
“I asked him to let me leave the club before the January transfer window.
“I told him I want to play and get back into the national team, because Euro 2012 is just around the corner, but it seems he doesn’t care.
“The possibility of two months loan to Leeds came two weeks later. The club blocked it.
“It was a glimmer of hope for me. It would have reminded the Poland manager about me, but I didn’t get the club’s approval.
“Do they do it maliciously? I’m sad they behave like that. I’ve become a slave to Manchester. I’m frustrated, but I don’t want to slander or criticise Ferguson. It’s not my style.
“I have respect for him, because, for me, he’s a great manager, but I hope he will let me go in January.”
A spokesman for United declined to comment.
Fergie, meanwhile, is closing in on 15-year-old midfield sensation Andreas Pereria from PSV Eindhoven. He claims he has agreed a deal to join United, thought to be around £4m.
He said: “I knew that PSV had given me my chance, but United is a great club.
“Other British clubs were interested but United is a dream club for me.
“I have been a few times to United to have a look. I got a tour and spoke with Sir Alex. Being 15 and being able to talk with him is great.”