Alisson admits Liverpool lacked their usual intensity in Tuesday night's goalless draw with Bayern Munich at Anfield.
The Reds will head to Germany in three weeks time for the return leg of their last-16 tie, with Alisson pleased his team did not concede an away goal.
"It was a tough game, we didn't have the same intensity we usually have," Alisson told Sky Italy.
"Bayern did excellent defensive work and I believe there are no favourites between us and them.
"It was important not to allow any goal, we could have won but we didn't."