Winterburn says people were 'naive' to expect Emery to turn it around straight away.
“It's going to be a slow process," he told Goal.
“I think we were a little bit naive if people thought the new manager would come in and everything would be absolutely fine.
"He really needs at least this season to progress, see where we go to.
“It could take a little while because there's some really good teams in that top four."