Hamsik has now matched Diego Maradona's 115 goals for the club.
"I heard from Marek immediately after the game," Juraj Venglos told Radio CRC.
“He was very happy because equalling such a record doesn't happen every day.
“He must keep going like this and then surpass [Maradona], even if he was happier about the win.
“I don't know if it was a burden on him, but this goal will certainly give him confidence going forward.
“It's a very nice chapter in his career. What makes him proud is that he's equalled this record as a midfielder.
“The Scudetto is the thing that his experience with Napoli is lacking the most, and winning it is his objective."