Rangers were already 3-0 down at the break when the playmaker was replaced by DJ Campbell in the defeat at Craven Cottage.
"That's not my problem at the moment," said Warnock. "I have no idea [whether he left the dressing room]. I've more worries than any individual when you lose 6-0.
"I don't think you can get carried away too much. You get days when Adel comes off. You're going to get days when he throws his toys out the pram, but that isn't a worry for me.
"If I sub somebody and they are happy, then I have more of a problem with that."
The defeat has left the R's in 11th place in the Premier League table.