"Officially signed for FC Tokyo," the 27-year-old said on his Twitter feed. "Excited for my new challenge."
Tokyo, who will resume the second half of the Japanese season six points behind leaders Urawa Reds, also inked a deal with 30-year-old Spaniard Sandaza.
Tokyo hope the pair will keep the goals flowing in the absence of Muto, who scored 13 times for the club last season.
Mainz splashed out 470 million yen ($3.79 million) on the player in May, according to local media.
(Writing by Peter Rutherford; Editing by Amlan Chakraborty)
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