The coach said he's made no decision about who will start the regular-season finale.
"This is in the best interest of our football team," Trestman said. "We need some better play from the quarterback position."
Cutler leads the league with 24 turnovers. Clausen hasn't started a game since his rookie year of 2010, when he went 1-9 as a starter and played in 13 games with Carolina.
Chicago opened as a 6.5-point home underdog but is now getting 8.5 or 9 points throughout Las Vegas.
The move comes as a major surprise. While Jay Cutler has faced scrutiny for his body language and demeanor, the team handed him a seven-year, $126 million contract last season. The move seems to indicate that Cutler is done for the season, and puts his career with the Bears in jeopardy.
Clausen has seen time in three games this season, completing three passes in nine attempts. His last start came back in 2010, his rookie season. That year, Clausen threw for 1,558 yards, with three touchdowns against nine interceptions.
The Lions are currently 7-point favorites, according to VegasInsider.com.
"Jay is our quarterback," Trestman said. "If he’s available to play, he’s going to play. Jimmy is continuing to work in the offense, and he practices. We certainly like having him on our football team, but as we get ready for New Orleans next week, Jay will get the reps and he’ll be playing."
Cutler signed a seven-year contract worth more than $126 million in January. He's completed a career-high 66.8 percent of his passes for 3,446 yards with 26 touchdowns and 15 interceptions in 13 games. He needs just two more touchdown passes to set a new career best in the category.
With the Bears down big, Clausen got a chance to lead the offense. He completed one pass for 22 yards. Clausen had five attempts. The Bears are on a bye Week 9.
Clausen completed his lone pass for nine yards in relief of Jay Cutler. Morgan racked up three receptions for 24 yards. Two of those catches came in the fourth quarter.
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