Miguel was reluctant to criticise fellow Portuguese and Valencia teammate Manuel Fernandes after the midfielder was barred from first team training for arriving late this week.
"I don't believe Manuel has been mistreated, but you'd have to ask him," said fullback Miguel. "Everyone spoke well of Manuel after the match against Mallorca. But against Rosenborg, we all played poorly.
"His omission could have happened to anyone, but I don't like talking about a player's private life. As a friend, I think he deserves his privacy. I'd prefer to talk about football."