Van Riemsdyk had one of the best seasons of his career in 2017-18 for the Toronto Maple Leafs, scoring a career-high 36 goals and adding 18 assists in 81 games.
It was his sixth season with the Maple Leafs, after he came over in a 2012 deal with the Flyers in exchange for defenseman Luke Schenn.
Van Riemsdyk is coming off a six-year, $25.5 million deal he signed prior to the 2012-13 season.
He was drafted No. 2 overall by the Flyers in 2007.