Chiesa came off the bench to score in the 4-2 win, with the Italy attacker turning the game in the hosts' favour with his performance.
Slot said afterwards: "After the fans sung for him so many times during the game already and last season as well, I think it is very nice for him to give them something in return – and that's definitely what he did today.
"An unbelievable atmosphere in the final minutes. I thought winning the league here would always be more special than winning a home game against Bournemouth, but the last six or seven minutes… wow. Wow, wow, wow. How impressive that was.
"As long as he is here he is definitely at Liverpool and I have no reason to believe something is going to change. He's had a hard time last season, getting his match fitness ready. Unfortunately for him, he missed out on our Asia tour as well, so then you miss quite a lot, but not only him – Joe Gomez the same and we've lost Conor Bradley.
"So, all my substitutions were also related to players who probably couldn't go for 90 minutes. Federico, when we needed him, I brought him in. At 2-2 you need your No.9, we brought him in and he delivered and that's always positive for your future at the club."