Markstrom, who is 2-2-0 with a 2.23 goals-against average and .926 save percentage, is attending to a family matter, Canucks general manager Jim Benning said Monday.
Thatcher Demko is expected to make his first start this season when the Canucks play the Detroit Red Wings at Rogers Arena on Tuesday (10 p.m. ET; SN1, FS-D, NHL.TV).
Vancouver (2-2-0), which recalled
Zane McIntyre
from Utica of the American Hockey League, begins a four-game road trip Thursday against the St. Louis Blues before playing the New Jersey Devils on Saturday, the New York Rangers on Sunday, and Red Wings on Oct. 22.