The tex-mex restaurant is the latest chain to be affected by a data breach, Chili's parent company Brinker International announced.
Chili's also posted a statement saying some of its customers had their payment information compromised.
"Currently, we believe the data incident was limited to between March - April 2018; however, we continue to assess the scope of the incident", Brinker International said in the disclosure of the incident.
According to the statement, Chili's was made aware Friday that some payment card information was compromised at certain restaurants.
The chain recommended not closing bank and credit card accounts but to monitor statements for accuracy.
Chili's officials said "we deeply value our relationships with our guests and our priority remains doing what is right for them". "We take the security and privacy of your data seriously and are working diligently to address this issue".More news: U.S. jets intercept pair of Russian bombers off Alaskan coast
Chili's does not collect certain personal information (such as social security number, full date of birth, or federal or state identification number) from Guests. The company said it is still investigating the incident together with law enforcement and third-party forensic experts.
"However, out of an abundance of caution, we recommend that you remain vigilant and consider taking one or more [.] steps to avoid identity theft, obtain additional information, and protect your personal information".
Brinker learned of the incident on May 11, the company said, adding that only certain restaurants were affected.
Brinker also didn't provide an approximate number of affected customers but promised to publish more details as the investigation goes forward.
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