The Foxes have one win in the last six Championship games. The club currently sits third in the table.
Maresca said: "The pressure builds and grows as you approach the end of the season.
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"Especially now, when we drop points and with the table so close, the pressure can build up a bit, but that's normal.
"We are not satisfied with the defeat, we never will be. But we don't have time to be disappointed, we have another game in 72 hours."