Matt LaFleur conceded he did not call a good enough game as a head coach after the Green Bay Packers' collapse in their shock 27-22 defeat to the New York Giants.
Playing in their first game in the United Kingdom, the Packers looked in command at Tottenham Hotspur Stadium after building a 20-10 half-time lead.
From there, however, the Packers scored just two points, which came on an intentional safety given up by the Giants at the end of the game, as New York produced a remarkable comeback.
A 15-play, 91-yard drive capped by a two-yard rush for Gary Brightwell saw the Giants tie the game at 20-20 before Saquon Barkley, who finished with 106 yards from scrimmage, averaging over six yards per touch, gave New York the lead with a two-yard run on a direct snap.
Green Bay responded with a drive to the Giants' six-yard line but failed to punch in the tying score, Aaron Rodgers seeing a fourth-down throw to Allen Lazard batted down before he was sacked on a failed Hail Mary attempt in the final seconds.
The Packers had dictated matters in the first half through the ground attack and the short passing game, but the run was a non-factor in the second, as Green Bay was forced to punt after gaining only 46 yards on their first two drives before the failed effort to tie the game.
While LaFleur credited the Giants' defense and their coordinator Wink Martindale for forcing the Packers away from the run, he did take responsibility for an anaemic second-half showing.
Asked if he anticipated going pass-heavy, LaFleur told his post-game press conference: "Just depended upon what they were giving us. Like I said, we had a lot of run-pass cans [options].
"They played a lot of single high [safety coverages], manned us up. Do you want to run into a loaded box or try to get it through the air?
"Unfortunately that didn't work for us. Like I said, give credit. Wink is a guy I got a lot of respect for. He out-coached us in the second half, and they outplayed us.
"Give New York all the credit. They out-coached us, they outplayed us. They definitely wanted it more. It was the tale of two halves. They kicked our butt in the second half. You can't do that in this league.
"Obviously the plan and the play calls that I gave weren't good enough.
"We just got to regroup. Everybody's got to look in the mirror and ask themselves what they can do better because it was a collective effort right there in terms of not being able to come out on top.
"They kept playing. Give New York a ton of credit. I don't think the mindset for our guys was ever to let up. Certainly you look at the results out there. There was too many mistakes. It wasn't just one person; it was a collective effort like I talked about.
"It starts with myself. I got to be better. I got to be better for this team. We got to demand that we get better in certain areas. It's just disappointing."