Abbey Mastracco of NJ Advanced Media adds that he will be with the Mets in time for the second game of the double dip.
Aoki, 35, has bounced around this season, spending time with the Houston Astros and Toronto Blue Jays before being released on Aug. 29.
In 83 games this season, the veteran has hit .274/.319/.402 with five homers and 27 RBI. Over the span of his six year big league career, Aoki is a .285/.350/.388 hitter.
With the glut of trades and injuries the Mets have sustained, it was only logical they add an outfielder. Jose Reyes and Matt Reynolds are better suited for the infield, so signing Aoki will help the team in that capacity.
Aoki will wear No. 11 and is under control through next season.