The Manchester United club badge on a corner flag
United claimed they had not been given right of reply to negative stories around the club.
Journalists from Sky, ESPN, Manchester Evening News and the Mirror were excluded after reporting some players were unhappy with Dutchman Ten Hag.
"We are taking action against a number of news organisations," the club said in a statement.
"Not for publishing stories we don't like, but for doing so without contacting us first to give us the opportunity to comment, challenge or contextualise.
"We believe this is an important principle to defend and we hope it can lead to a re-set in the way we work together."
Speaking at the news conference, Ten Hag said: "They should have come to us first and not go around our back printing articles - that is not the right thing.
"If the players have a different opinion of course I will listen, but they haven't told me, or maybe one or two [players], but the majority want to play like this - proactive, dynamic, brave."
United, who are seventh in the Premier League table, face Chelsea on Wednesday.
-- Courtesy of BBC Sport