Heinicke is expected to start Thursday's game against the Dolphins, Chris Tomasson of the St. Paul Pioneer Press reports.
Should the Vikings keep three quarterbacks until Teddy Bridgewater (knee) is able to return from the Physically Unable to Perform list, it appears Heinicke will be in good shape to win a roster spot. In Sunday's game against the 49ers, he led a game-winning drive, which included running for a two-point conversion to secure the victory. Heinicke will now get a chance to build on that performance in the preseason finale, with Mitch Leidner likely in line to pick up most of the snaps behind center in the second half.