He says the legendary boss, who celebrated 25 years in charge of United at the weekend, does not care about the Pole's Euro 2012 dream.
Kuszczak said: "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've talked to Ferguson recently. I asked him to let me leave the club now, 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 a two-month loan to Leeds United came up 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 have respect for Ferguson because, for me, he's a great manager, but I hope he will let me go in January."