MATC Infraestructura, a unit of cell tower owner and operator American Tower, sued TV Azteca for nearly $97 million in a New York state court, saying the company has defaulted on a loan.
In an interview, Alberto Moreno, a senior director at Fitch, said the agency will likely evaluate what the case means for TV Azteca's credit rating.
"Our sense is obviously this is not favorable or positive for the credit profile of the company," he said. "We will continue monitoring."
A spokesman for TV Azteca declined to comment.
The broadcaster did not confirm or deny having defaulted on the loan from American Tower in court papers, but argued it had not been served properly.
In April, Fitch upgraded TV Azteca's outlook to "positive" from "stable," noting that the company had reduced its net debt by 23 percent in 2017.
The market has viewed the dispute in New York as part of an ongoing negotiation between TV Azteca and American Tower, Moreno said.
"They (TV Azteca) have enough liquidity and enough access to financing in order to cover their obligations," he said.
(Reporting by Julia Love; Editing by Phil Berlowitz)
By Julia Love