The Texans dropped to 2-2 in their season as they blew a 17-point lead at home to the Seahawks, losing in overtime, after Schaub allowed the visitors back into the game by throwing a pick six into the hands of Richard Sherman.
"I just want to clear it up," safety Manning told Yahoo! Sports Radio 1560. "Matt, we're riding behind him 100%. I don't think anyone - of course we were all pissed off about plays, everybody's like that.
"DBs make mistakes, you want the whole team to be upset, even the player that made the mistake, you should say something. Matt has been a man about this whole time. He told us how he felt, what's going to change, what needs to change."
Houston face the San Francisco 49ers in week five.