"We got ourselves back with a fantastic freekick but then went to sleep for two seconds, putting ourselves under pressure by conceding a second goal," Sheringham said at the post-match news conference.
Pune City drew first blood when their captain Marcelinho struck from an Emiliano Alfaro cross after taking advantage of a defensive error but ATK soon cancelled out the lead with a thunderous freekick from Bipin Singh after the break.
"We got ourselves back with a fantastic freekick from Bipin and then we switched off. You got to stand up today, it happens in football. We went to sleep with no marking. It's no great from my point of view and something we need to work on."
ATK had shown the stomach to fight in the first-half and created many opportunities but it turned out to be a lopsided scoreline in favour of the visitors in the end.
Terming it a team failure, Sheringham backed their trusted goalkeeper Debjit Majumder.
"You can't really put it down to Debjit. First goal was a mistake, we can't blame him for that. The second one was from a far post header and our midfield should have cleared it, the third and fourth ones came off deflection," he said.
"From my point of view there's nothing to blame Debjit, sometimes that happens in football. He performed well in the first game. It's not always the goalkeeper's fault," he said strongly backing his goalkeeper.
Pune coach Ranko Popovic gave credit to Rohit Kumar's goal and said it was a key moment in the match.
"The key moment was the second goal, it gave us the push. We wanted to play more compact, play as a team. We did not know we will win by a 4-1 margin. We played smart football," the Pune coach said.
"He played with the team, for the team. His performance was good of course," Popovic said.
"He is one of the best players in the league. This is what we want from him, we hope he will continue at the same level in the next match."
On scoring the brilliant header off Marcelinho's corner to help them snatch the lead, Rohit Kumar said: "I saw the corner and just wanted to go for it and it was great to come back 2-1.
"It was most important to play well and win the match. I keep learning from the coaches, and keep developing everyday. Everybody wants to play in the Indian team and I also hope for the same," he said with a glint in his eyes.
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