Sven-Goran Eriksson insists the England fans will not influence his decision to bring back Wayne Rooney.
England supporters chanted Rooney's name as the team lost their way in Saturday's 1-0 win against Paraguay.
Many fans stayed behind after the game to see the Manchester United striker practice on the pitch.
Eriksson says he is "optimistic" Rooney could play some part in Thursday's game against Trinidad and Tobago but that decision will come from the England coaching team not the supporters.
Eriksson said: "It can't have an effect on me. I have my coaches, my fitness coach and my physios and we have to decide together: 'Okay it's time'."
The England boss, however, will not rule out the idea of Rooney returning against Trinidad and Tobago in Nuremberg.
Asked whether Rooney would appear, Eriksson said: "I'm very optimistic, always. I'm born like that. We have to decide that day by day, to be honest."