Plymouth knocked Liverpool out of the FA Cup on Sunday, winning 1-0 at Home Park.
Muslic said this morning on BBC Radio: “It was a magical day for us as a club, for us as an organisation, for the Green Army.
“It was a historical day so you can imagine a lot of emotions, a lot of smiling faces all over the place but today is already Monday so we are looking forward to the next obstacle for us and it’s a massive one for us on Wednesday against Millwall.”
On his emotions during the game, he said: “I was just pretending (to be calm). I was calm outside but like a volcano inside. It was just important for me to manage, to keep a good balance also with my emotions because I have to consistently deliver a message to the lads.
“It's important because the heat is on, the game is anyway emotional. It is important for me to keep a good balance so I can stay focused and support the lads but believe me it was also very, very special for me.”
On his approach, Muslic added: “Our plan was just to use this beautiful competition - it's the FA Cup, the most famous cup in the world and it's a huge stage. The world is watching because it's Liverpool, it's a live game so it was a perfect opportunity to represent Argyle as best as possible. It was a perfect stage for the lads to show themselves and I think we did it well.”