Van Riemsdyk signed a one-year, $800,000 contract with the Capitals on Saturday, Frank Seravalli of TSN.ca reports.
Van Riemsdyk scored his first goal of the season in Sunday's 4-3 overtime loss to the Oilers.
Van Riemsdyk played in his eighth consecutive game Friday against the Golden Knights, skating a season-high 17:56, but still posted zeros across the board in points, hits, blocked shots and shots on goal.
Van Riemsdyk served as a healthy scratch for the third straight game Friday against the Capitals.
Van Riemsdyk was held off the scoresheet for the fourth consecutive game in Monday's 8-6 loss to the Maple Leafs.
Van Riemsdyk returned to the lineup Saturday against the Lightning after serving the previous two games as a healthy scratch. He skated just 12:46 with two hits and two PIM.
Van Riemsdyk returned to the ice Saturday against the Wild after sitting out the prior two games as a healthy scratch. He skated just 12:17 and finished the game with no points, one shot on goal and a minus-1 rating.
Van Riemsdyk notched his second assist in three games in Tuesday's 4-1 loss to the Flyers.
Van Riemsdyk (shoulder) is in line to return the lineup for Friday's contest against the Ducks, Michael Smith of NHL.com reports.
Van Riemsdyk will not play Saturday against the Blue Jackets, Michael Smith of the Hurricanes' official site reports.