Gianluca Scamacca struck for the visitors in the first-leg of their Europa League semifinal.
"I expected a few more goals, to be honest," Gasperini told Sky Italia.
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It was a great goal, good movement and the pass with the right timing. Clearly, in this type of match it will be fundamental to create more situations like that in Bergamo, because we only really threatened them again late on.
We had to struggle tonight, but it's a good result, as Olympique lost once here all year against PSG and give their best in this stadium."
He added: "We have an incredible opportunity, 1-1 is a good result and we need to win. Whether we do it in 90 minutes, after 120 or with penalties, but we want to reach the Final."