[5] He was assigned on an amateur tryout (ATO) to make his professional debut with American Hockey League (AHL) affiliate, the Portland Pirates.

[8] Leading the team with 121 points, surpassing his previous best,[9] he helped London capture the 2016 Memorial Cup at the ENMAX Centrium in Red Deer, Alberta to end his major junior career.

[13] Initially sidelined to begin the 2018–19 season due to a pectoral muscle injury, it was subsequently announced that Dvorak required surgery to repair same.

[18] With the decision made by the Canadiens not to match an offer sheet tendered to 2018 third overall selection Jesperi Kotkaniemi, the team suddenly had a void to fill at the center position.

Dvorak made his debut for the Canadiens on September 27, 2021 in a pre-season game against the Toronto Maple Leafs, where he scored a goal and added three assists.

"[23] Two days later, on October 29, Dvorak scored his first career hat-trick in a 7–4 victory over the St. Louis Blues, notching two goals within minutes of the third period and adding an empty netter at the end of the game.

[27] On January 4, 2024, it was announced that Dvorak would miss the remainder of the 2023–24 season for yet another torn pectoral muscle, marking his second consecutive season-ending surgery after appearing in only 30 games during the course of the campaign.