Chicago Bears coach John Fox, citing turnover-filled, blowout losses on the road as the reason, confirmed that rookie quarterback Mitch Trubisky will replace Mike Glennon in Monday night's nationally televised game at Soldier Field.
"Four games is not a huge sample size," Fox said on WBBM-AM's "Bears Coaches Show" Monday night. "But we didn't give ourselves a chance in two games."
Glennon committed 7 of his 8 turnovers in the 2 road losses. In the 29-7 loss at Tampa to the Buccaneers, he threw 2 interceptions and lost a fumble. Last Thursday night in Green Bay, he was picked off twice and lost 2 fumbles.
"We have to change that," Fox said. "Is it all (Glennon's) fault? No, but he did have his hand in it, and now we're going to see how Mitchell does."
It was "just a decision I thought needed to be made," Fox said. "We've had 10 giveaways in the first four weeks of the season, and you can't win football games that way. Not that they were all one guy's fault, but we're going in a different direction."
Trubisky, the second overall pick in the draft, has not taken a snap in a regular-season game but produced a 106.2 passer rating in the preseason. He was Glennon's backup in the first four games, as the Bears went 1-3.
Teammates have been impressed by Trubisky's play in practice, and Fox noticed it as well.
"He's improved," the Bears' coach said. "He's got a better understanding of NFL defenses. He has to prepare and watch the opponent and be ready to go in and play. He's extremely accurate, and the (added) dimension is the mobility.
"He does have a quiet confidence. He doesn't get real up or down. The guys respond to him, and I think he's got that maturity and confidence that you have to have at that position."
Glennon will be the backup, and Mark Sanchez remains the No. 3 quarterback.
• Follow Bob's Bears reports on Twitter @BobLeGere.