Patrick had a healthy offseason to train for the first time in three years after having abdominal muscle surgeries following the past two seasons.
"That's so important for a player, especially for a young player," coach Dave Hakstol said. "So important to be able to have that time. [I've] been able to talk a few times with Nolan, he's got a great routine, he's feeling really good. I think it's going to pay huge dividends for him and our team."
With Patrick and van Riemsdyk on the second line, likely with Voracek, it would allow the Flyers to use Couturier, Giroux and Travis Konecny on the first line.
Couturier, who will miss the start of preseason because of a lower-body injury sustained in a charity game Aug. 10, set personal NHL highs last season in goals (31), assists (45) and points (76), tied for third in the NHL with a plus-34 rating, and was second in voting for the Selke Trophy.
Giroux, playing left wing for the first time, was second in the NHL with 102 points (34 goals, 68 assists), six behind Connor McDavid of the Edmonton Oilers.