The Spanish international was greeted by crowds of cheering fans when he agreed a two-year loan from Chelsea in the summer, but things haven't gone according to plan.
Torres has only managed one goal against Empoli and was dropped for last weekend's game against Fiorentina, only being brought on for the last 10 minutes.
"I didn't come here to kill time, but to leave a mark. We want to get back into Europe and rebuild the great AC Milan.
"It was a challenge for me to come to a new championship. I am proud of what I managed in Spain and England and I would like things in Italy to go the same way."
Reports in Italy suggest that Torres will start against Cagliari tomorrow thanks to the support of AC Milan president Silvio Berlusconi.