Stefanski blamed the loss on other things.
The Browns scored touchdowns on their first three possessions. Their fourth posssession came after the Chiefs scored.
Aiming to regain a two-possession lead and burn clock, the first three plays were gives to Chubb, for gains of 6, 17 and 4 yards. He fumbled on the latter, near midfield.
The game was a dogfight from then on, with the Chiefs cutting a deficit to 22-20 after three.
Trailing by five in the final moments, Mayfield and Kareem Hunt connected on a 19-yard gain to near midfield. On first down, though, Mayfield tried to avoid a sack while getting grabbed around the ankles. He threw an interception with 1:09 left.
Stefanski was firm and sympathetic, saying, "Ultimately, (Mayfield) has to take care of the rock. He was trying to throw it away. He's very hard on himself."
Cornerback Denzel Ward lamented the turnover differential. The Browns didn't have a takeaway.
"The main focus is that we've got to attack the ball and take it away and put our offense in better position," Ward said Monday. "We've got to find a way to take the ball away in the next game."
The Browns are an early 12-point favorite against Houston in their home opener.
Mayfield fell to 0-3 as the starter in Browns openers. Tyrod Taylor, Houston's No. 1 quarterback now, started for the Browns in the 2018 opener, a 21-21 tie with Pittsburgh.
Stefanski agreed with Ward as to turnovers, saying, "Minus-2? You're not going to win a close game when you have that."
Tretter scoffed at any notion of blaming the loss on Mayfield's late interception.
"There's a ton of game before the fourth quarter," Tretter said. "This isn't an all-Baker thing and Baker has to be the one to lead us to the promised land. Everyone has to be dialed in.
"We played well early on at Kansas City. Now it's a totally different opponent and totally different game plan.
"I don't look at 'what does this mean going forward?' We move on the the Texans."©2021 www.beaconjournal.com. Visit beaconjournal.com. Distributed by Tribune Content Agency, LLC.