Leicester captain Wes Morgan says his side's shock opening-day defeat at Hull was the "reality check" they needed at the start of their title defence.
The Foxes, who lost only three out of 38 Premier League games in 2015-16, were beaten 2-1 by the newly promoted and managerless Tigers at KCOM Stadium.
"We tried, but we were second-best," Morgan told Sky. "Hull deserved to win.
"We need to learn from the negatives to put it right. We will work in training and cut out the little mistakes."
Leicester looked vulnerable defensively against a makeshift Hull side and also struggled up front, with Jamie Vardy missing three good chances.