The 29-year-old signed the contract in the presence of his elder brother Baffour and manager Samuel Anim Addo at the Regal International East Asia Hotel owned by the club.
Shanghai SIPG was represented by their General Manager Mr. Chan at the signing-on ceremony.
The club was unable to organize a press conference to unveil Asamoah Gyan as their latest signing with the team traveling to Guangzhou to face R&F in an away league match.
The unveiling ceremony is now likely to take place next week Tuesday or Wednesday as the side will return from the league match on Monday.
Gyan after signing the contract said: “I thank God for this special day, to my family, former playmates at Al Ain and to my fans.
“I reserve the rest of my comments for the official unveiling next week.”
Asamoah Gyan signed onto a two-year deal with an option for a renewal having passed a routine medical.
The Black Stars captain is arriving from Al Ain where he has enjoyed immense success for the past four years.