The right-hander will be formally introduced during a Thursday news conference at AT&T Park.
Cueto posted a photo on Twitter of him at the ballpark Wednesday, writing: ''It's an even year and I'm ready to roll. Glad to be on board. Vamos!'' or ''let's go!'' in Spanish. The reference is to the Giants' World Series championships in even years: 2010, '12 and '14. They missed the playoffs in 2011, '13 and this year.
Under the agreement, Cueto can opt out after the 2017 season and become a free agent again. He is due to earn $46 million before the opt out.
In San Francisco's new-look rotation, Cueto joins right-hander Jeff Samardzija, who was introduced last Friday after formalizing his $90 million, five-year contract