Zielinski struck to cancel out Kevin Lasagna's opener for Udinese.
“We need to build on the second half, which is where we showed that we can play our style of football," Zielinski told Sky Sport Italia.
“We created lots of scoring opportunities and could've had more goals. We needed a confidence-booster, as we all know the period we are going through, so we must build on that second half.
“We're going through a tough time at the moment and have to do much better, because we are a big team. Unfortunately, these periods happen in football.
“Now we have to focus on Tuesday's game with Genk, which is very important for us."