Simone Inzaghi admits Lazio are already feeling the pressure in Celtic's Europa League group.
The Coppa Italia winners were beaten by CFR Cluj in a shock result in matchday one, leaving them bottom of the group after Neil Lennon's side drew with Rennes.
Tomorrow the Biancocelesti face Rennes in Rome, and their coach knows they can't afford any more slip-ups if they're to progress to the last 32.
"It's a complicated group," Inzaghi said in his press conference this afternoon.
"Cluj have played a lot of matches, and we've seen the Slavia Prague side that they played.
"Celtic and Rennes have history on their side. Celtic regularly win their League and Rennes beat Paris Saint-Germain in the Super Cup.
"We all have a chance of going through.
"For us tomorrow is a final because we're coming off the defeat in Romania. That's what I've said to the lads, and usually we approach finals in the right way.
"It's crucial for us to take points against a strong and organised team."
