Reports emerged overnight suggesting Pellegrini had been left fuming that a Twitter account had published his starting line-up correctly for 89 straight matches.
The Hammers boss was said to be demanding who was feeding information to @ExWHUemployee, worried confidential team planning was being leaked to opposition.
But Pellegrini said: "It’s not true. I’m not angry about that. I’m not aware of the team being leaked.
"In every team I have managed, the day before the game I work the set-pieces so all the players know the day before who will play and who will not.
"So many players can talk with others and I am not keeping the starting XI three or four hours before the game.
"We work every day so there are a lot of reasons why people can know the team."
Asked who was leaking the information, he added: "I don’t have any idea and I don’t worry about that. I worry about trying to win the three points.
"I don’t think it’s the most important thing. Maybe if you’re going to play against Chelsea, Watford or Liverpool, you are sure it will be the same starting XI as they played the last game and they play exactly the same way.
"I don’t hide too much about the starting XI."
Pellegrini is desperate to end a run of four straight defeats in the Premier League when his side visit Everton on Sunday.
But he will make the trip to Goodison Park without midfielder Jack Wilshere and striker Javier Hernandez.
The Hammers boss said: "Javier Hernandez is sick. He has has had a virus for ten days and he is at home and couldn’t work the whole week.
"And Jack felt a pain in his ankle two days ago. We will see in the next days what is the risk.
"He doesn’t have a chance for Sunday. On Tuesday we will know after he has a medical review."
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