Inter needed a late goal from Nicolo Barella to earn the point.
“The first half was very hard for us because Slavia played at such a high tempo and pressed us,” Lukaku said.
“In the last 20 minutes we created lots of chances to score, but it wasn’t the perfect game today because we didn’t win.
“We have to work hard to improve this season. As a team, we have to work hard every day to do what the Coach wants because we have the ability to do really well, but we need to work hard every day.”
On the Derby della Madonnina on Saturday, he added: “We’re a great team and anyone who comes up against Inter knows it will be difficult for them.
“We’ll be very well prepared for the game, for sure.”
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