The Australian goalkeeper was dropped for Monday's home match with Tottenham Hotspur with
Federici's partner took to her now-deleted Twitter account after the 3-1 defeat to express her disappointment at McDermott's decision, leading the Reading boss to calm talk of problems behind the scene.
"There's nothing I can do about someone's Twitter feed," he said.
"I can't help what players or their girlfriends put on Twitter - if that's the case, then it's a shame.
"The fact of the matter is that I spoke to Adam and made a decision that
"No player at the club has a position that means they will play every week - no player."
In her online rant,
She may have been referring to Federici`s absence despite his long service to the club, but McDermott added: "
"He works really hard, but things haven't gone his way at the start of the season so Alex has come into the team. It's no different for a full-back, centre-half or striker.
"If there is Twitter stuff going on and there are emotional messages then there is not a lot I can do about that.
"I'm not one of these managers that says you will get fined £1000 for going on Twitter."
English Premier League
Manchester United earned a record £61 million ($94.43 million) in Premier League television revenue this season en route to a 20th English title.