Left-handed reliever Raul Valdes has been recalled from Triple-A Buffalo to replace Tatis on the major league roster.
While the Mets are losing Tatis, they are closer to the return of shortstop Jose Reyes. He plans to be back in the lineup Tuesday after missing
nearly a week with a sore back.
Valdes was with the Mets from April 11-June 24. He was 2-2 with a 5.10 ERA and one save.
"We needed someone that could give us some length," manager Jerry Manuel said.
Tatis has really struggled this season, hitting just .185 (6-for-41) with two home runs and six RBIs.
"He wanted it to heal naturally, but he's had some problems with it," Manuel said. "He's been dealing with it for a while."
Meanwhile, Reyes was scratched from the lineup against the Florida Marlins last Wednesday in Puerto Rico because of tightness in his lower back and hasn't played since.
The speedy shortstop, who was picked to his third All-Star team on Sunday, took some swings before the series opener against Cincinnati and should be in the starting lineup against Reds left-hander Travis Wood on Tuesday night.
"He can swing from the right side right now, as we speak," Manuel said.