Johnson was an emergency recall. Goaltender Mike Smith left Phoenix's game Wednesday night with what the team called a lower-body injury, and Jason Labarbera finished the Coyotes' 5-1 victory against the Columbus Blue Jackets.
"Basically we caught it very early," Phoenix coach Dave Tippett told Fox Sports Arizona's Todd Walsh. "Hopefully it's nothing that lingers on too long."
Johnson has six games of NHL experience with the New York Rangers, and is 14-8-0 with a 2.80 goals against average and .912 save percentage this season for Portland in the AHL.
Rundblad has appeared in one of Phoenix's three games this season. A first-round pick in 2009, Rundblad was the return for Kyle Turris in a trade with Ottawa during last season.
He is back with the team because Rostislav Klesla is out with a lower-body injury.