"It was a tough game, we knew that, and had done the most important thing which was taking the lead. Then we made some silly mistakes that you cannot afford against an experienced side like Olympiacos," he said of the 2-1 home loss. Goran Pandev put Lazio ahead before Olympiacos overran the hosts with goals from Luciano Galletti and Darko Kovacevic.
"We also had some good opportunities to get back into it, but unfortunately were unable to convert them."
Rossi has struggled throughout the current campaign to keep Lazio in the running with a small squad that has been plagued by fitness worries.
"We have had a lot of injuries and know we don't have much strength in depth, so we need everyone to be in good shape to really survive in this competition," continued the Coach.
"Yet in games like this the psychological factor often counts even more than the physical. Conceding the equaliser so soon after our goal was a real blow."
"We played a great game against Real Madrid at the Olimpico. We realise it won't be easy, but all we can do is go there and give it our best."