Davis' axe comes in the light of his implication in photographs taken during Pompey's five-day break in Malaga last week.
But Redknapp insisted there was nothing sinister about his absence.
He told the Portsmouth News: "Sean Davis was there but you can only have five subs. I had a goalkeeper. And then I had a left back because I haven't got anybody who can play left-back if I get an injury.
"I had a right-back, I haven't got anybody who can play right back if I get an injury so I had Lauren. Richard Hughes has been playing well for me so I stuck him in as a midfielder because he played last week at Bolton and played against Chelsea and did a good job for me. Unlucky to be left out really.
"And I had Baros up front, so Sean couldn't make the bench unfortunately. There's no problem with Sean, that's life and that's football."