Schwartz told the Detroit Free Press he would decide by Friday if Stafford would play against the Minnesota Vikings on Sunday. The coach hasn't determined if third-string rookie passer Kellen Moore will be given reps in practice this week behind backup Shaun Hill.
The injury to Stafford comes on the heels of a disappointing start to the season. He's struggled to extend plays and build rhythm offensively. The 1-2 Lions went into the campaign hoping Stafford would continue from where he left of last year, throwing for 5,000-plus yards and 41 touchdowns.
Detroit must find a way to get back on track against a schedule that doesn't ease up after the Vikings. The Philadelphia Eagles, Chicago Bears and Seattle Seahawks come next, and a pair of meetings with the Green Bay Packers sit on the horizon. A healthy and productive Stafford will be needed to survive the storm.
Follow Marc Sessler on Twitter @MarcSesslerNFL.