The reigning Premier League champions were well beaten at the Parc des Princes, having just three shots, none on target, and 26% possession.
Liverpool will now be hoping to overturn PSG’s lead in the second leg at Anfield next Tuesday (April 14).
Speaking to TNT Sports after the game, Slot admitted his side were lucky not to be down by even more goals.
"If you reflect on the whole game I think we are lucky with only losing two nil. The first goal felt hard," he said.
“I think it was very good for us we are still in the tie, we can bring them to Anfield and we know how good Anfield can be for us."
When asked about whether his side created enough chances, Slot responded: "Yes and no, yes because we want to create much more chances, no because there was not a lot to create for us.
“We tried many times to get them high, but they were able to play through us when we went man-to-man. I think that happened in the second half as well. There were a few times with players in promising positions."