Capturing Log information in Mockito

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I’m writing unit tests for a Java 8 project with testng and Mockito. I have a class that I’m testing that initializes the Logger without a constructor as such:

class MyTestClass {
    protected static final Logger LOG = LogManager.getLogger("MYLOGGER");
    public void someMethod(){"This should be logged");    

I know if the Logger is passed as an argument to the constructor, I can use a spy. But this is legacy code, and I can’t add a constructor, unfortunately.
I’m wondering if it’s possible to capture and verify the content of the log message in a test?
I would greatly appreciate any help with this. Thank you.