He claims he was made the fall guy for the affair.

他声称他是此事的替罪羊。

《柯林斯英汉双解大词典》

Cynics say that MPs have made the speaker the fall guy for their own avarice.

讽世者说，议员们让议长成为自己贪欲的替罪羊。

youdao

So why do I feel like the patsy, the fall guy, the blindsided winger in rugby who knows he is about to be felled at the ankles after receiving what in the game they call a "hospital pass"?

那么，为什么我像个替死鬼、受骗党，像橄榄球场上毫无防备的边锋接到他们所说的受伤传球(hospital pass)时快要摔倒崴脚的样子？

youdao

The fall guy may have been involved in the situation, but was not the person who should be blamed.

VOA: special.2010.02.21

He would agree to be the loser. the fall guy.

VOA: special.2010.02.21

Today,a fall guy is anyone who is tricked into taking the blame for the crime or wrongdoing of someone else.

VOA: special.2010.02.21

Riza later offered himself as the fall guy for Annan's decision, but neither paid any penalty.

FORBES: Freedom's Edge

To those who believe athletes ought to be paid for their labor, Webber is the fall guy for a system that's horribly broken.

WSJ: College Sports and the Giant Albatross��Rachel Bachman

LONDON--It might not have been all his fault, but Michael Martin has become the fall guy for the expenses controversy that has riled British politics over the last two weeks.

FORBES: British Politics