Major League Baseball also says it is aware of a report by Metro Boston that a man claiming to be an Astros employee was removed from a credentialed area near the Boston Red Sox dugout during the AL Championship Series opener at Fenway Park.
A thorough investigation concluded that an Astros employee was monitoring the field to ensure that the opposing Club was not violating any rules.
The Metro USA report noted that Major League Baseball security had been warned about the man because of "suspicious activity" in the ALDS against the Indians. "So I think everybody has a general feeling for what's going on".
Last year, the Yankees and the Red Sox both accused each other of spying.
The incident - which led to the employee's being removed by security - is expected to lead to nothing more than a fine for the Astros, according to sources.
During the Astros' series-clinching win on October 8 at Progressive Field in Cleveland, a man with a cellphone standing by the photographer's pit was removed "several times" by security personnel, a person familiar with the situation told The Associated Press on Tuesday night.
"I'm always concerned about [sign-stealing] throughout the season", Cora said after the game. But did the Astros cheat?
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Jackie Bradley Jr blew open Game 3 of the ALCS on Tuesday with a grand slam off Houston Astros reliever Roberto Osuna.
"I compare the series to those Saturdays in the late '90s when FSU and Miami played, that there were a lot of first-rounders and a lot of swag and good athletes", Cora said.
There was no indication of any suspicious activity during Game 3 in Houston on Tuesday night, but the Red Sox were careful to change their pitch-calling signs throughout the night - something Manager Alex Cora said is fairly standard for the Red Sox.
"We were playing defence, we were not playing offence", Luhnow said before Game 4 of the ALCS. He was then removed from the media-credentialed area.
Indians pitcher Trevor Bauer went on Twitter earlier this season and intimated that Houston's pitchers were possibly using pine tar to improve the rate of spin on pitches.
Yahoo reported Oakland's players believed Astros players were relaying stolen signs during games and the team asked for an investigation. The MLB has since closed its investigation into the matter, per Forbes.